There's a square area... tank tanks on one side in the perfect corner (readerfect), and the healers stand in the corner on the other side of the box-ish thing... thereby allowing them to heal without needing to move. DPS (melee and casters) set an audiotrigger for the big los ae, and run out of los when it goes... then get right back on him.
It's easy, really. Kill the puppets when they spawn asap, or you're dealing with more mobs.