Same exact kinda thing happened to me last night...many, many times

I consider myself to be about correctly gear to kill this bastard, kept all my debuffs + commanding shout up the whole time, chugged a few ironshield pots ect ect...and still found myself peacefully dirt napping while the rest of the raid ran like hell. Could be that I only had 1 healer and that was the problem, idk, but, I feel your pain
Edit:Tank should have 2 healers on him for this...right?