What decides on the direction of Zon'ozz balls? We've left this Heroic till last because we still wipe on it on Normal a lot even though we farm some of the other Heroics. We can make the berserk, kill all the tentacles fine and survive black phases but every try the ball ends up going wilder and wilder with each bounce, until 7 when the tank just can't cover the distance in time. Many thanks
Edit: By last I obviously don't mean after Deathwing, I mean last of the first 5.