After much practice, you and an ally have become adept at fighting in close proximity to one another.
Benefit: 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.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.