If he's inciting an incident so that you have reason to stab someone, I'd say that's his fault. He just wanted to be without blame and prove someone was a psychopath.

[ Vincent doesn't stop working even though Heather has. He sets another poorly-made badge to the side before he picks up the cardboard to start cutting circles in it. ]

I think it'll be faster if I just make the circles first instead of stopping each time to decorate. [ While he may be talking mostly to himself, he shares his thought process with Heather all the same. The sound of cardboard being cut fills the silence as he thinks about his answer. ]

I already told you it bothers me, but I find the implications and meaning behind the actions to be much more significant than the fact we ate someone. [ He frowns as he holds up the skeleton that's left of the cardboard - it has a lot of holes in it and none of them are uniform. ]

Ah, well. [ He tosses the piece to the side and picks up a circle instead. ]