I've been trying to finish the missing in action side-quest, but something seems to have gone wrong. I've stormed the keep and killed everyone in sight, but Thorold just keeps attacking me so I can't save him. I tried punching him a few times to see if that'd make any difference but I accidentally beat him to death and failed the quest. I'm guessing this isn't supposed to be happening, but has anybody else had this? Is there anyway to complete the quest from here or should i just kill the idiot and be done with it?