From Pathfinder #159: All or Nothing, which isn't enabled.

Deny Support

FEAT 10

Access Help either the Washboard Dogs or the Diobel Sweepers destroy their rival.

When you succeed or critically succeed at a Deception check to Feint an opponent, that target can't flank with their allies until the beginning of your next turn.

Pathfinder #159: All or NothingOGL