You can use a creature you’re grappling to protect you from harm. If you’re grappling a creature and are attacked with a melee or ranged attack, as an immediate action you can attempt a grapple combat maneuver check against your grappled opponent. If you succeed, the incoming attack targets your grappled opponent instead of you. If you fail, the grappled opponent breaks free from the grapple and the incoming attack targets you as normal.
Pathfinder Roleplaying Game Mythic Adventures © 2013, Paizo Publishing, LLC; Authors: Jason Bulmahn, Stephen Radney-MacFarland, Sean K Reynolds, Dennis Baker, Jesse Benner, Ben Bruck, Jim Groves, Tim Hitchcock, Tracy Hurley, Jonathan Keith, Jason Nelson, Tom Phillips, Ryan Macklin, F. Wesley Schneider, Amber Scott, Tork Shaw, Russ Taylor, and Ray Vallese.