IMPROVED BACK TO BACK [Teamwork, Combat]

     After much practice, you and an ally have become adept at fighting in close quarters with each other.

Prerequisite: Back to Back, Perception 5 ranks.

Benefit: While adjacent to an ally who is flanked and also has this feat, you can spend a swift action to gain a +2 bonus to AC against all flankers until the start of your next turn.