Been getting it randomly time to time. Not sure if it is just 'random' or something is up with it. Seems to happen more on garrosh and nazgrim.
Anyway, tanking casually on 14/14 H farm , pulled first boss and I got 370k vengeance on second white attack (?) . Then it kept dropping obviously and had around 200 k with 6-7 stacks and boss hitting me , pretty normal. But wtf is that random spike ? Happened on nazgrim 2 weeks ago also, had around 500k vengeance spike after first white hit after execute during berserker stance. Also happened on garrosh this week on pull , had around 450k on 3rd melee hit.
Are the bosses actually using crushing blow or is it totally random? And no, I am not sitting to get crit in my face or some other retarded shit like that.