I got to the third boss on heroic, thought I could do the same thing as with normal-crazy dps before tp, and drag him down the hallway dps again until he is dead. Got owned so hard and it was not even funny. After the tp, the rain of fire hits for 2-5k on each toon. I have to eat two shots on all 5 toons before I can get out. And he often banishes my priest and shadow bolt valleys after that. If the fight got to the second tp, it was all over since he would be surrounded by voids. More dps needed i guess.