Just like Giyu you were friends with Sabito and when he died you felt so guilty even more than Giyu it was enough for you to quit the demon corps

You had nightmares about the demon who killed him his death haunted you but this dream he was sitting on the boulder he had cut before the selection his fox mask covering his face but the noise he made was one of disappointment

"Quitting the Corps? I died and you're willing to let others die because of me. Urokodaki didn't teach you for nothing."