Most of the bosses in the instances are glitched and eather dont attack or you cant attack them.
Do not get mad it is hard to script the bosses they have to modify them to meet donor specks for a challenge in the game. Most mobs in Instances are modded to fit the donnor aspect of Hp Mp and Ap. Do so this is why most of the bosses are buged in instances, because where just to good.
