That laughter just makes Billy want to beat Tommy's face in until it's purple, but he holds back. It's what their captors wanted or some shit, right?

"You'll be the purple one in a few minutes. I don't give a shit about what you said or if you don't want to be enemies. I don't care. Get someone else to finish your little experiment if you want." He's done here, and leaves Tommy's room with a hard slam of his bedroom door.