I managed to kinda do it last night. Did a few things:

1. Set the focus of my tank and healer to bran so I could keep an eye on his health. My healing is done by mouse over macros and a repeater region on isboxer....I moved the focus unit frame just below my repeater region and extended it.

2. I already use seal of command on the tank as standard to keep the AoE threat up.

3. Parked my toons in the middle of Bran's room for Phases 1 and 2.

4. When phase 3 started I kept an eye out for the first lazer, when that triggered, I put the toons on strobed follow of the tank to move them out of the lazers and popped the earth elementals on the 4 shaman.

5. Chain healed as much as I could.

6. The shaman DID all die, but I'd lasted longer than I had done previously.

7. At the end, I bubbled the pally but still continued to tank the adds.

8. The pally did die....but Bran had lasted long enough and the event was completed.

I'll try to refine my movement on the end phase...and try not to worry so much about killing the adds so much as making sure that they're on the tank or the elementals.