for heigan have your casters stay on the platform and your melee slow dance at 30 yards during phase1. When he teleports you have about 5 seconds for your tank to head to the start of the room and your casters to do the same (you can follow and hope they make it in time, throw off some COHs, holy novas, etc to heal everyone up), get into strafe spot, and then start strafe dancing during the fast phase. rinse and repeat, shouldn't hopefully have to go through more than 2 or 3 dances.