Wall Street seems to be in a combative mood these days. Finra arbitration cases are up nearly 50 percent this year, and attorneys involved in the proceedings think they know why: the increase in market volatility. "As Warren Buffett said, when the tide goes down you learn who's swimming naked," said Stuart Meissner, a securities law attorney and managing member at New York-based law firm Meissner Associates. If that's the case, Finra's latest case filings numbers show there are a lot of players in the securities market suddenly running for towels.