Lock onto unseen dretch and hit at a speed much higher than his mouse sensitivity is set did it for me. Although I had my suspicions as he walked through the hall and seemed to look towards the center room, seemingly for no reason. I suspect the bot was locking onto aliens in the center, but near enough. Directional noises are easy in the hallway, which rules out listening for something in my book.
Also, at one point he is near the alien side, the bot seems to lock onto something behind him and turn him around, he pursues to find a goon coming up from behind.
Insta-ban is what I would do. Probably even a subnet ban.
edit: not a sip and I'm posting in the wrong thread, I think I need some sleep