If you done it 25 times you should know by now that the boss aoe shackles anyone within 5m, why would you cluster around the boss like that? Don't kite the boss , spread out , melee within 5m back off, healer breaks shackle.
You guys zerg'd the hell out of him , didn't spread out (merc was right on top of the boss lol) .
it doesn't matter that it shackles us. we can remove the shackle. we focus on faster kill. it doesn't matter how many times the boss shackles as long as the shackles don't keep bugging.