There is a corridor just off of their room with doors that you can open and close by standing on pressure plates.No threat management, IE: How do you "tank" one away from the other when they are just doing whatever they please.
We started off the fight and I grabbed the dudes attention and held him for quite a while on one side, but with no healer, he out damages my heals before the CD is reset.
Have everybody standing in that hallway, pick up a boulder, get their attention, run toward that hallway, hit one of them with a boulder so the other one follows you into the corridor, close the doors, separating them. Kill 'em one at a time.