Before Richman, Chief Judge, and Wiener and Willett, Circuit Judges. Don R. Willett, Circuit Judge: A trusted prison inmate was working unsupervised in a hog barn when the ceiling collapsed, striking him in the head. He told the prison agricultural specialist that he needed medical attention. But the specialist thought the inmate looked no worse for wear and ordered him back to work. A short while later, the inmate asked another prison staffer for medical attention. The staffer radioed a supervisor. Based on the staffer’s report, the supervisor, too, thought nothing serious had happened and did not immediately grant the request. The inmate’s condition later worsened. He was sent to the hospital and diagnosed with a traumatic brain injury. The district court granted summary judgment to Defendants based on qualified immunity. For the reasons below, we AFFIRM. I Kevion Rogers was a trusted inmate. Prison staff let Rogers work unsupervised and outside the prison’s security fence. Rogers’s daily job was to help take care of the prison’s hogs. One day Rogers went into one of the prison’s hog barns looking for a powder used to keep baby hogs healthy. As he was leaving, part of the barn’s ceiling collapsed and hit him on the head. Rogers blacked out. After he came to, another inmate took Rogers to see the prison’s staff agricultural specialist, Jeffrey Jarrett. Rogers walked normally into Jarrett’s office. And though Rogers “had dust on him,” his only visible injury was a scraped knee. An agitated Rogers demanded “to go to the infirmary.” But from Jarrett’s perspective, Rogers “looked fine.” Rogers didn’t “look hurt,” and spoke without a slur. Jarrett told Rogers to keep looking for the powder. Rogers walked normally out of the office. He did not see Jarrett again that morning. Jarrett’s job responsibilities took him away from the prison to another unit. Rogers tried to go on about his business. But he was “lightheaded” and had to sit down. Other inmates tried to keep him awake as he drifted “in and out of consciousness.” Soon after another prison staffer arrived to get the inmates ready for lunch. Rogers told the staffer that “the ceiling collapsed on [his] head” and showed the staffer the “debris.” Rogers again asked for medical attention. The staffer radioed Jarrett’s supervisor, Jeremy Bridges, and informed him “that the ceiling had fallen on [Rogers's] head and that [Rogers] had sustained a head injury.” Bridges radioed back to take Rogers “back to [his] bunk” so Bridges could “take a look at [him] later.” But Rogers objected—he still wanted “to go eat lunch.” Rogers’s objection made Bridges think whatever injuries Rogers had were not “serious.” Bridges radioed back that going to lunch was fine. He’d be out to check on Rogers “soon.” For whatever reason though, Rogers was still brought back to his bunk. By the time he reached his dormitory his condition had begun to deteriorate. His head and eyes had begun to swell, his face was bruising, and he was showing signs of respiratory distress. Prison staff at the dormitory thought this was “abnormal,” and so Rogers was redirected to the prison’s administrative building. He collapsed on the way there, began to “seize violently,” and started “vomiting.” Rogers “lost consciousness.” Within minutes prison staff at the administrative building summoned medical assistance. Emergency medical services evacuated Rogers to a nearby hospital by helicopter. Hospital staff diagnosed Rogers with a “traumatic brain injury; no hemorrhage.”[1] Rogers sued Jarrett, Bridges, and the Texas Department of Criminal Justice in Texas state court. Under 42 U.S.C. § 1983, Rogers alleged that prison staff violated his Eighth and Fourteenth Amendment rights by acting with deliberate indifference towards him. Under the Texas Tort Claims Act, Rogers alleged premises-liability claims. Defendants removed the case to federal court and moved for summary judgment on all claims. The district court granted summary judgment to Defendants on Rogers’s § 1983 claims, declined to exercise supplemental jurisdiction over his TTCA claims, and remanded the case to state court. Rogers timely appealed. He argues that Jarrett and Bridges were deliberately indifferent towards his serious medical needs and thus not entitled to qualified immunity.[2] II We review summary judgment de novo.[3] Courts may grant summary judgment on an issue only when “no genuine dispute as to any material fact” exists “and the movant is entitled to judgment as a matter of law.”[4] A fact dispute is “genuine” if “a reasonable jury could return a verdict for [the nonmovant] based on the evidence.”[5] “[W]e must view all evidence and draw all justifiable inferences in favor of [Rogers], the nonmovant.”[6] Still, “[c]onclusional allegations and denials, speculation, improbable inferences, unsubstantiated assertions, and legalistic argumentation” do not count for raising a genuine fact dispute.[7] III Rogers contends that the district court improperly granted Jarrett and Bridges qualified immunity. We have explained before that plaintiffs bear the “burden” to “demonstrate the inapplicability of the defense.”[8] And Rogers had to meet that burden for each defendant.[9] That means Rogers had to (1) raise a fact dispute on whether his constitutional rights were violated by the defendants’ individual conduct, and (2) show those rights were “clearly established at the time of the violation.”[10] On this record, Rogers failed to meet either prong. A Rogers contends that he raised a fact dispute on a constitutional violation. He argues that both Jarrett and Bridges acted with deliberate indifference towards his serious medical needs, violating his Eighth Amendment rights in the process. But “[d]eliberate indifference is an extremely high standard to meet.”[11] As the Supreme Court has explained, Rogers needed to raise a fact dispute on whether Jarrett and Bridges were each “aware of facts from which the inference could be drawn that a substantial risk of serious harm exists,” and actually “dr[ew] the inference.”[12] And serious harm isn’t just any harm. Rogers’s medical need had to be “so apparent that even laymen would recognize that care is required.”[13] The district court found “no evidence that would permit a jury to infer that Jarrett and Bridges had subjective knowledge of the severity of Rogers’s condition.” We agree with the district court. A reasonable jury could not conclude on this record that either Jarrett or Bridges actually inferred that Rogers was at substantial risk of serious harm. As the district court noted, the record supports that both Jarrett and Bridges knew that Rogers had been hit in the head. But as recounted above, Jarrett did not perceive any apparent injury to Rogers other than a scraped knee. From Jarrett’s perspective, Rogers was “look[ing] alright” and “[didn't] look hurt.” Rogers “had dust on him,” but did not have visible injuries, did not slur his speech, and walked normally into and out of Jarrett’s office. The same goes for Bridges. All he knew about Rogers’s injuries was what he’d been told over the radio: that Rogers “had sustained a head injury” after a ceiling collapse. But Bridges testified that he did not think it was a particularly severe injury since Rogers had requested “to go eat lunch” while he waited for Bridges to come see him. Indeed, Rogers did not develop severe symptoms—seizures, vomiting, and loss of consciousness—until later on. And once he did, prison staff rendered medical aid within minutes. Rogers disagrees. He argues that fact disputes over what happened preclude summary judgment; that the district court misapplied the deliberate-indifference standard; and that Supreme Court and our caselaw compel a contrary conclusion. We are unconvinced. First, Rogers argues “that there is a genuine issue of material fact in dispute as to what actually happened on the morning of the incident,” precluding summary judgment under our decisions. But the district court analyzed Rogers’s claim under his version of events. And Jarrett and Bridges do not dispute what they knew when. Rather, the only dispute on appeal is what inferences Jarrett and Bridges drew from what they knew. Because the inferences Rogers asks us to make are speculative, this argument fails.[14] Second,Rogers argues that the district court misapplied the deliberate-indifference standard. In Rogers’s view, “the ultimate question” that his claim turns on is “was [he] exposed to a ‘substantial risk of serious harm’”? But that misstates the standard. It is not enough for Rogers to have raised a fact dispute on whether Jarrett and Bridges “actually drew the inference that [a] potential for harm existed,” as Rogers argues. The Supreme Court was clear in Farmer v. Brennan: “an official’s failure to alleviate a significant risk that he should have perceived but did not, while no cause for commendation, cannot under our cases be condemned as the infliction of punishment.”[15] We have likewise been clear: “[L]iability attaches only if [officials] actually knew—not merely should have known—about the risk.”[16] Bottom line: Mere negligence is not enough. Third, Rogers misreads Supreme Court and circuit caselaw. “[T]he takeaway” from the Supreme Court’s decision in Estelle v. Gamble[17] is not that nonphysician prison staff are “expected to allow prisoners to consult medical experts because they themselves are not qualified to diagnose or treat . . . medical condition[s],” as Rogers suggests. The takeaway is that courts must “separately consider” the allegations against physician and nonphysician staff alike when deciding deliberate-indifference claims.[18] And our decision in Austin v. Johnson[19] adds little, if anything, to support Rogers’s claims. Rogers admits that his case is “unlike” Austin because neither Jarrett nor Bridges “failed to get medical treatment for [him] after [seeing] his conditions worsening.”[20] B In sum, Rogers failed to raise a fact dispute over whether Jarrett and Bridges acted with deliberate indifference. But even if he had, he’d still need to show that his rights were “clearly established at the time of the violation.”[21] As we have explained many times, that takes showing that “the violative nature of particular conduct is clearly established.”[22] It just isn’t enough to identify a right as “a broad general proposition.”[23] The district court did not address qualified immunity’s second step. Jarrett and Bridges argue, though, that even assuming a violation, the law was not clearly established under this standard. We agree with Jarrett and Bridges. In barely half a page of briefing Rogers argues that the Supreme Court’s decision in Estelle “clearly established [the] law govern[ing] the substance of this entire dispute.” But the only right Rogers identifies as being violated was his right to be free from deliberate indifference towards his serious medical needs. That generalized proposition of law is not enough. The Supreme Court has articulated an exacting standard. Rogers needed to point to “a case or body of relevant case law in which an officer acting under similar circumstances was held to have violated the Constitution.”[24] And Estelle just isn’t that case. The Supreme Court reversed us in Estelle that the doctors had acted with deliberate indifference towards the prisoner.[25] And on remand, we held that the nonphysician prison staff likewise didn’t act with deliberate indifference.[26] Therefore, we cannot agree with Rogers that he has shown that Jarrett and Bridges violated clearly established law. For the first time at oral argument, though, Rogers’s counsel argued that our recent decision in Sims v. Griffin[27] supports that Jarrett and Bridges violated clearly established law. “[W]e cannot and will not consider arguments raised for the first time at oral argument.”[28] Under the Rules of Appellate Procedure, Counsel should have advised us of any “pertinent and significant authorities” that had come to his attention after briefing had concluded “by letter.”[29] But even had Rogers’s counsel filed that letter, Sims is not the helpful precedent he thinks it is. All we recognized in Sims was what had already been clearly established in our circuit: “[A] prisoner can show his clearly established rights under the Eighth Amendment were violated if a prison official ‘refused to treat him, ignored his complaints, intentionally treated him incorrectly, or engaged in any similar conduct that would clearly evince a wanton disregard for any serious medical needs.’”[30] We have held officials liable for violating that standard before, including when the record supported that they: “offered no treatment options to a patient with a history of cardiac problems who was experiencing severe chest pains;”[31] “knew [a prisoner] had swallowed a bag full of drugs, vomited multiple times, screamed for help, pleaded to go to the hospital, and had steadily deteriorated since his arrival at the jail;”[32] and personally witnessed a prisoner’s head being struck “repeatedly,” causing him to go “unconscious.”[33] Rogers, though, would have us read these cases as clearly establishing that any report of any strike to a prisoner’s head is enough to trigger a duty for officials to seek advanced medical care for the prisoner. They do not. No reasonable official would read them that way, and so we disagree with Rogers’s formulation of clearly established law.[34] IV What happened to Rogers was unfortunate. Maybe it was negligent. But was it the product of deliberate indifference? Not on this record. And even if it were, these officials did not violate clearly established law on these facts. Bound by our controlling immunity precedent, we AFFIRM. Don R. Willett, Circuit Judge, concurring: Today’s decision upholding qualified immunity is compelled by our controlling precedent. I write separately only to highlight newly published scholarship that paints the qualified-immunity doctrine as flawed— foundationally—from its inception.[35] For more than half a century, the Supreme Court has claimed that (1) certain common-law immunities existed when § 1983 was enacted in 1871,[36] and (2) “no evidence” suggests that Congress meant to abrogate these immunities rather than incorporate them.[37] But what if there were such evidence? Indeed, what if the Reconstruction Congress had explicitly stated—right there in the original statutory text—that it was nullifying all common-law defenses against § 1983 actions? That is, what if Congress’s literal language unequivocally negated the original interpretive premise for qualified immunity? Professor Alexander Reinert argues precisely this in his new article, Qualified Immunity’s Flawed Foundation—that courts have been construing the wrong version of § 1983 for virtually its entire legal life. Wait, what? As passed by the Reconstruction Congress, Section 1 of the Civil Rights Act of 1871 (now colloquially known as § 1983) read this way: [A]ny person who, under color of any law, statute, ordinance, regulation, custom, or usage of any State, shall subject, or cause to be subjected, any person within the jurisdiction of the United States to the deprivation of any rights, privileges, or immunities secured by the Constitution of the United States, shall, any such law, statute, ordinance, regulation, custom, or usage of the State to the contrary notwithstanding, be liable to the party injured in any action at law, suit in equity, or other proper proceeding for redress . . . .[38] The italicized language—the “Notwithstanding Clause,” as Professor Reinert calls it—explicitly displaces common-law defenses.[39] The language that Congress passed makes clear that § 1983 claims are viable notwithstanding “any such law, statute, ordinance, regulation, custom, or usage of the State to contrary.” The language is unsubtle and categorical, seemingly erasing any need for unwritten, gap-filling implications, importations, or incorporations. Rights-violating state actors are liable— period—notwithstanding any state law to the contrary. Then things went off the rails, quickly and stealthily. For reasons lost to history, the critical “Notwithstanding Clause” was inexplicably omitted from the first compilation of federal law in 1874.[40] The Reviser of Federal Statutes made an unauthorized alteration to Congress’s language. And that error was compounded when the various revised statutes were later published in the first United States Code in 1926. The Reviser’s error, whether one of omission or commission, has never been corrected. Today, 152 years after Congress enlisted the federal courts to secure Americans’ constitutional rights, if one were to Google “42 U.S.C. § 1983,” the altered version that pops up says nothing about common-law defenses. According to Professor Reinert, that fateful, unexplained omission means that courts and scholars have never “grappled” with the Notwithstanding Clause’s significance.[41] All to say, the Supreme Court’s original justification for qualified immunity—that Congress wouldn’t have abrogated common-law immunities absent explicit language—is faulty because the 1871 Civil Rights Act expressly included such language. Those sixteen lost words, by presumably encompassing state common-law principles, undermine the doctrine’s long-professed foundation and underscore that what the 1871 Congress meant for state actors who violate Americans’ federal rights is not immunity, but liability—indeed, liability notwithstanding any state law to the contrary.[42] These are game-changing arguments, particularly in this text-centric judicial era when jurists profess unswerving fidelity to the words Congress chose. Professor Reinert’s scholarship supercharges the critique that modern immunity jurisprudence is not just a textual but counter textual. That is, the doctrine does not merely complement the text—it brazenly contradicts it. In arguing that qualified immunity is flawed from the ground up, Professor Reinert poses a provocative question: “If a legislature enacts a statute, but no one bothers to read it, does it still have interpretive force?”[43] It seems a tall order to square the modern qualified-immunity regime with Congress’s originally enacted language. But however seismic the implications of this lost-text research, “‘[a]s middle-management circuit judges,’ we cannot overrule the Supreme Court.”[44] Only that Court can definitively grapple with § 1983′s enacted text and decide whether it means what it says—and what, if anything, that means for § 1983 immunity jurisprudence.[45]