True. The Carvers in Diablo were a pain to kill unless you had a bow or magic. Same with polymorphed creatures in Divine Divinity. A Wizard or Ranger would have the ability to hit them from a distance, though.
Try putting yourself in the mind of the creature. If you were feeling ill enough that you couldn't equip yourself for battle, and a party of two - one Warrior, one Wizard - came in and started combating your comrades, would you turn and flee deeper into the cave or join the battle none-the-less? This isn't a loaded quesiton - I'm curious at what people-orcs would do. And I'll ask the same question a second time, only this time you're all alone.