Tank can keep on the LR-5 in the center of the platfor, rdps and nail him for the the right, left, back or front...mDPS run out and plant spark bubble away from rDps/ healer and tank then force leap or force speed back into fight. Easy, just takes a little awareness by mDPS.
does not work all that well plus they have to be really good mdps for this to even be part of this plan. yes i have tank this and see the epic fail mdps try and the rare "good ones". and the best ones still force the tank off the center at some point usually its 35% hp on the boss or before 99% of the time and this is even with guild mates.