Intrepid Rescuer (Combat)Source Inner Sea Gods pg. 213 (Amazon)
You instinctively react to interfere with foes that attack your allies or innocents.
Prerequisites: Combat Reflexes, worshiper of Kurgess.
Benefit: Whenever an opponent you threaten makes an attack against a helpless, prone, or stunned ally or any attack against a noncombatant, that opponent provokes an attack of opportunity from you. If your attack of opportunity hits your foe, she takes a –4 penalty on the attack roll that provoked this attack of opportunity.Source Weapon Master's Handbook pg. 25 (Amazon)
When an opponent provokes an attack of opportunity from you as a result of the Intrepid Rescuer feat, if your attack of opportunity hits, you can spend 5 stamina points to cause the opponent’s attack to automatically miss your ally.