You have learned how to force your enemies to move around the battlefield.
Benefit: You do not provoke an attack of opportunity when performing a reposition combat maneuver. In addition, you receive a +2 bonus on checks made to reposition a foe. You also receive a +2 bonus to your Combat Maneuver Defense when an opponent tries to reposition you.
Advanced Player’s Guide. Copyright 2010, Paizo Publishing, LLC; Author: Jason Bulmahn.