I've done this a few times and on Very Easy it fails the same every time.
At about the point of the second stack up with the caster, I get hit with the add and killed.
I've got aggro on the add, Was I killed by friendly fire? [Which I have never seen in the game before]. or something else. I have watched a video of the whole fight and of course this did dnot happen? Help? Point to a video that shows issue?
Thanks, Guess I'll do phy dps role to move on.