Foes without a swim speed provoke attacks of opportunity from you underwater.
Prerequisite(s): Combat Reflexes, must have a natural swim speed.
Benefit(s): A creature that lacks a swim speed provokes an attack of opportunity from you when it attacks you underwater. You don’t get an attack of opportunity if the attacker is under the effects of freedom of movement.
Pathfinder Roleplaying Game Monster Codex © 2014, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, Logan Bonner, Jason Bulmahn, Ross Byers, John Compton, Robert N. Emerson, Jonathan H. Keith, Dale C. McCoy, Jr., Mark Moreland, Tom Phillips, Stephen Radney-MacFarland, Sean K Reynolds, Thomas M. Reid, Patrick Renie, Mark Seifter, Tork Shaw, Neil Spicer, Owen K.C. Stephens, and Russ Taylor.