It's Karkat's turn to be relieved, significantly so, that he's actually gotten a 'thank you' instead of more insisting that everything's awful and they all need to die. He hazards another wary pat on the back, and exhales heavily.

"I, uh..." He swallows. "When I first found out about all this shit I was mad at you," he says. "For making sure I didn't die? Because I thought I was never going to be a real person and it would have been better if I died before I pupated and finding out it was actually someone's fault I was alive in the first place..." He trails off, realising he's getting kind of off track. "But I then actually read your shit a few times and... look, I... thank you."