One of minotaur's have amulet which reduces slicing damage but increasing bludgeoning (twice both ways). Examine them. Equip bludg weapon to all team members and put him down first. Then dispatch second. Due to generally low levels mages are not that usefull as usually. I had 2 warriors, cleric, rogue. No probs (yes, some members will be k.o.\dead at the end most likely).