This reminds me of time where I went and got a demon prisoner as a companion. So after he joined, our group proceeded to some nearby lair to kill a werewolf. Upon entering, the werewolf said the usual things, but then the demon started breathing something, and the announcements said, "The swordsman is caught in a cloud of boiling maroon demon extract, you are caught in a cloud etc...", except nothing happened. To make a long story short, the demon ended up running in and punching the werewolf's head off. Later after I fast traveled to a nearby village, it said that I had a fever and my speed was like 50% lower. I tried sleeping and waiting, but the symptoms stayed. Later, I set off again because I figured that the symptoms really didn't do much. Suddenly, while fast traveling, I was ambushed by goblins, and they proceeded to kill my companions. I was smirking and sitting back because I thought the demon would slaughter them, except he didn't do ANYTHING! He just stood still while we were getting slaughtered, and was ignored by the goblins. Now I keep on thinking that the demon had planned this from the start, first by making my companions slower in a place where it could seem like an accident, then planning for the goblins to attack when in the forest so that he could return to his former civilization. Guess all demons are devious creatures that can't be trusted.