Oh... duh lmao! Yeh I had him in my party. He sometimes freaks out like Arhu unexpectedly and starts attacking my party. This mostly happens if a trap is set off causing burning damage.
This may be a feature (but needs to be polished a bit), he attacked me in the trap house because I teleported him too often and he got angry, or the female companion also attacked me after a fight. She told me something that she don't want to be with us because she got friendly fire or something...
