Given that the creature in the darkness was provably unable to turn off his super-strength when hitting Miko, and his desire to be accommodating mysteriously did not shut down his damage reduction when Miko or Belkar slashed at him, the idea that he on any level went "huh, he just cast a mind control spell at me--I guess it would be rude to be immune to them right now" is, while not one of the goofier ideas proposed here, still pretty darn goofy.