Divine Displacement

Your gods see your faith in them weighs as much as the faith in your friends. 

Upon witnessing an attack made on an ally, you create a divine warp gate displacing your ally with any other target creature in sight (You may target yourself). The target creature must make a DEX save DC 15 (+ your charisma modifier). Upon failure the displaced creature will take the attack instead. Upon a succesful save, you will displace yourself with your ally and gain +1 to your AC for the turn.