The room before this guy has slanted walls. We pulled him to this room and pushed him through the walls. He fell (taking me, the tank along with him) down below the tower. The raid camped out as fast as they could while I kept him occupied. After I died we had to summon my body to the graveyard (the only place in torment where you can summon bodies) and had a rogue drag me back to the raid. Looking back on it, it was a really stupid idea to fight him there but I'll post it here so you don't do the same. :)