I don't know what happened but I guess a few trolls were lured onto your priest. I had no clue about any luring untill the boss was dead and I talked with my party.
I would like to offer by deepest apologies about that, I do not want the clan ZzOuTkAsTzZ to be ran in that fashion and I informed the mage that he will not do anything like that again. There is no rule about KS'ing when it comes bosses and he was attempting to protect a kill but I told him he can not do that.
I hope there was no XP loss because of his actions.
Again, I'm truly sorry this happened.