If i shield my paly when he is already in combat, the aggro goes to my priest. So i usually shield just before i enter combat. Then i would run with the whole team with the paly leading, collect as many mobs as i can. The shield usually runs out and retribution aura holds the aggro. I then drop consecration and my 3 mages would spam AE. The priest gets no aggro and just cast flash heals. Then i break follow and let my team drink and use pally to loot. By the time i finish looting, their mana is full and im ready to pull the next pack of mobs.