If you're a securities defense litigator who fell into the pit of despair last week when you read about the plunge in securities class action filings, as tallied by Stanford and Cornerstone Research, it may already be time to start clawing your way back out. On Monday, NERA Economic Consulting came out with its midyear 2009 report on securities class actions, and it's a lot more upbeat than Cornerstone's. Yes, NERA acknowledges, new filings fell in June to 14, the lowest number since the ten filed in February 2008. But according to the study's coauthor, that drop could turn out to be as momentary as the dip in new filings last June and July.