One dispell has removed all stacks aslong as I have been doing the boss which is since release of the dungeons if you don't know the mechanics don't comment on them.
remove the stacks if you don't the tank might suddenly die know this from my DK when I tank it, if I have all CDs ready to go when the hawks come I can survive quite a bit but when they are up I'll drop.
you wanna have heals flying to the tank when the hawks come and possibly a CD, but save guardian spirit for the second wave of adds and if the dps don't kill them, call them out on it.