Had a similar situation yesterday at copperbell hm. We ended up trying and trying on the last boss until time expired. We should have just kicked him but I didn't want to abuse the system. The bard didn't understand the fight mechanics, couldn't dodge aoe, and would not move the rocks. He also never responded when we tried to talk to him. All of us were pretty nice to him as well. He had af armor and all of his accessories were amber rings/earrings/etc, basicaly all vitality boosting gear and no dexterity. Plus like a lvl 42 bow. It was mind numbing.