You can perpetrate a dirty trick and deliver an attack before your opponent is the wiser.
Benefit: On your turn, you can perform a single dirty trick combat maneuver in place of one of your melee attacks. You must choose the melee attack with the highest base attack bonus to make the dirty trick combat maneuver.
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.