User blog comment:ScoobycoolDoo/Who's the mole?/@comment-65.24.114.104-20111118125807/@comment-65.24.114.104-20111118200133

He didn't tell Aqualad, you just thought he told Aqualad -- he said it to Aqualad, deliberately where Red Arrow would hear it, report it, and then Aqualad would be beyond suspicion.