I apologize if this has been brought up before, I've ran into it a couple times now and just wanted to raise the issue.
I've now had 2 games where the Rook AI has gone braindead. The first game the Rook was played by an opposing Nightmare AI player. He reacted and fought fine at first, but later just shut down, stood there, and let me kill him. He did seem to recover after the death and start playing again.
The second time was more serious. In this case it was a Rook AI ally on Hard difficulty, he never once moved or did anything. He sat comatose at his original spawn location the entire game. I'm not sure if him dying would have reactivated him or not, as he was just ignored the whole game 
Has anyone else been seeing this, with the Rook or other Demigods?