So I had this thought bouncing around my head since reading the description for Ancient Miasma. Basically what this does is turns all healing into a shield that stacks up to your maximum health, essentially rendering it impossible to gain life during this phase. What i'd like to know is what would the viability of a strategy in which the prot warrior tank (or hell, any warrior) in getting damaged to <35%, triggering second wind, and getting a continuous flow of 3% max hp per second as a shield on top of your hp. Stacking some stamina (like profession bonuses and duel stam trinkets) I calculate that 900k raid buffed is certainly achievable. This equates to a 27k shield being applied each second, on top of the sbarriers. between those two sources, your healers would have to spend very little time healing you, roll a cheap hot and be done. Since the absorb is basically acting as the players new health bar, you wouldn't be in danger of getting killed until the bloodrage phase. I sim at about 60k DTPS, so taking that down to half, under my own power seams incredibly powerful.
The danger would lie in the careful hits to get to <35% to begin with. DPS warriors would benefit almost more in that the ~16k hps they would do to themselves would practically remove them from healer attention, but it would be even more difficult to achieve a safe >35%.
I don't know, its probably a better bet to take impending victory, spam it on CD and just be happy you wont be over-healing all the time now.