I park my guys in a star formation at pillars of the circle with their backs to the pillars, each has a healing totem and their all within reach of a chain heal. Just eat up the damage and be aware of the timing of the transformation/surges as it seems to be an aggo wipe. I postion the camera of the tank really high up in the ceiling so I can keep track of everything and grab aggo with hand of reckoning - works everytime. Agree with jimbob above, moving will kill you.