The NFL has been rocked by the "bounty" scandal in which New Orleans Saints defensive co-ordinator Gregg Williams paid players to injure the opposition. The saga took a new twist last week when audio was released by documentary-maker Sean Pamphilon of Williams ordering his players to "go for the heads" of players who had a history of concussions and to injure the ACL (anterior cruciate ligament) of a player who had a previous knee injury. The problem was that Pamphilon was only in the room to hear those words because he was filming a documentary on former Saints player Steve Gleason, who has a terminal illness. In releasing the audio Pamphilon has ruined his relationship with Gleason. ESPN spoke to Pamphilon, who himself doesn't know if he did the right thing.

When is it right to "whistleblow"?