Originally Posted by TheNevers 
Me and my friend see him weaving spell in his immune bubble,
my rogue friend think it might be a good idea to put some nasty traps under him since he's ignoring us.
what happen after the conversation is, well, he's dead by the traps as he lower his bubble, my party aren't even on the same screen when he dies.
I always considered the trap implementation in BG2 so badly unbalanced that it was tantamount to a cheat, and therefore I stopped using it. But to each their own, of course.