Sans doesn't really have an accurate measure on how angry he is or isn't, and this whole soothing music business is seriously skewing his readings. It has generally seemed pretty easy to keep his cool, relatively speaking, which is maybe why it feels so off putting when something finally snaps and relents to the rising frustration in his gut.

He'd thought he wanted Greg to understand he wasn't a very good person, but receiving feedback that suggests he's succeeded doesn't make him feel any better either. Forgiving him outright and saying it was okay would feel stupid and cheap, while calling him a murderer...it doesn't feel fair, and it doesn't feel any better. Maybe there's no actual words that can magically give him what he wants out of this, when what he really desperately needs is for this rare plea to be understood without complication.

Maybe Greg isn't very bright, or maybe Sans is just impossible to please. As usual. Heh. What Sans absolutely doesn't have is the capacity to deal with failure when it comes to showing this shred of emotional intimacy.

He instinctively feels like this would be a really satisfying time to vanish. Not in a self hating sort of way, specifically, but like...literally to disappear without another word. Like, it would feel sort of hardboiled, you know? And that overt act of being badass and cool would mean that he wouldn't have to deal with the awkward situation that this has become emotionally.

Turning your back first makes you feel like a chump.

His knuckles crack with the pressure he's putting on his own balled fist. Sans isn't a guy that makes a habit of being angry, and now that it's happening...well, this is something that needs to be analysed, and not vented. Just say something and then go. He's silent for another lingering moment, and then:

"...Take it easy, Greg."

And then he stalks off.