During the Proving Honor quest of the Companions Quest-line, after Farkas' tranformation, in the second interior space (I forgot the name), Farkas stops fighting. He'll just stand there like a statue and let the bandits hit him a bunch of times, until he falls down. Like a statue, he falls down, still holding his Greatsword, but never moving once combat starts.

I have a lot of mods installed, about 123, including Deadly Combat, Duel Combat Realism, and ACE Realistic Combat, but I've never seen this lack of behavior before.

So, which mods are known to mess up Farkas and whether or not he will fight, or even notice that he's being hit?

Thanks in advance.

That's a mod?