Unfortunately, he doesn't change direction fast enough.

"Yes," Karkat rasps out. "Yes, fuck, of course I will. Bert, that was Terezi, Terezi and Redglare, fuck. She's dead, Bert, she's fucking dead, she shouldn't have died that fast, she's culled so many more trolls than I ever did, fuck. Fuck."

To his acute embarrassment, he realizes he's crying from his undamaged eye, staining the white of Cuthbert's blouse with red.