The Ones Who Walk Away From Omelas Conquerers, Spattered With The Viscera Of Its Weak And Decadent People, Chapter 3:
"Goddamnit! I'm sorry, I just - why am I even apologizing to you, this is all you, it's not my fault. I mean, look. As has already been confirmed many, many times, I am a pathetic failure as a troll. Just - saw my horns off, paint me brown, and call me the Karkat human. Actually, no, the humans are better trolls than me at this point, Lalonde probably wouldn't hesitate to tear you in half. Maybe I'm some kind of chess guy. Fuck, I've solved the mystery at last! We're a couple of chess guys doing troll cosplay, that's what happened here."
"Anyway, that is the extent to which I am failing to kill you right now. I am failing to kill you even though, one, I loathe you (platonically), two, you're already fucking dead, and three, if you were thinking straight you'd want me to kill you."