We want cleric stance

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Not even the strongest dps class would be able to effectively kill a healer with cleric stance

It seems like you have never played healer in pvp before, would it be wolves den or front lines, or even in pve for that matter if you would even consider healing yourself with cleric stance up.when a DRG double crits you with a combined damage of 2.9k instantly (GCD and offGCD attacks), reminder that without the vitality buff from having a tank in your party and without any vitality whatsoever (accessories or attributes), you have 3670hp, 2.9k is a lot.

they have no sustain to do so.

You don't want sustain damage in pvp, you want BIG bursts and thats it.