Personally I hope he just starts laughing maniacally and from there we can just beat him in the head until we knock the evil out of him.

[He says this completely deadpan.]

But I'm not sure that everyone would agree with me on that idea, so there are some alternatives.

[Sort of. He's really just making things up as he goes.]

I know some people that sense that thing's presence. Hopefully they can tell if someone is possessed by him too.