Improved Back to Back

System: Pathfinder | SRD

Types: Teamwork

After much practice, you and an ally have become adept at fighting in close proximity to one another.
Prerequisites Back to Back, Perception 5 ranks.
Benefits

While you are 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.

Source: Ultimate Combat

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