I'm not. I don't think he did it. He'd have just...stabbed someone right out.

[From how weakly Brett says it, he knows full well that stabbing might not have been the full extent, and he doesn't super want to think about it!]

I - I hate knowing they're just out there, maybe waiting to do it again, but...

[..........]

Well, we don't really have enough information to figure it out.