We could just be really creepy about this scenario everyone hiding under covers and cloaks and open the door to the large giants and wait. Then went they discover the craziness Gidd flies out from Morzul's belly screaming.
Liame's attacks are a consistent source of damage, but don't have many dice; so even with a CdG, I can't inflict enough damage to insta-kill. It's a shame these giants have so many HP.