Edward O’Donnell blew the whistle on “the Hustle,” a high-speed mortgage-selling scheme that led to a $1.27 billion fine against Bank of America in 2014. On May 23, an appeals court threw out the penalty – but O’Donnell still gets to keep a $58 million reward.

How come? The answer lies in a complex web of cases against the bank and the different funds used to cover different alleged violations.