[ He would've dropped it, if she hadn't bothered to say what she did. But instead of moving to the van, he just stands there, being the one here to ruminate on what she's saying-- her logic. Because it's one thing to want to not kill someone, but the reasons she's giving just rubs him wrong. Confuses him. ]

Sam didn't want to kill that guy to make him change his mind. [ He pauses, just for a second or so. ] Do you want to kill her, or do you wanna hear her say she was wrong?

[ Because that's what Heather seems to keep coming back to: this person not learning their lesson, not understanding what they did wrong. The revenge is secondary, the fulfilment and release--it's about trying to be the better person, or thinking you are, from what Heather's said. Something like that. ]