August: No...I-I need those too, baby...
"Really..oh no...I never closed...the staircase...still open.."
He stood, and stumbled back upstairs
August takes this opportunity to fuckin' sprint past him, knocking Kat off balance and giving him more time to escape
This knock off-balance caused Kat to fall back, and he crashed right back down the stairs, falling to his doom
August: Shit! Katsumi...
He stopped briefly and looked back
"Ugh...h-heh...August...mi a-mor...come back.."
You couldn't see it, but he was bleeding from the back of his head
August: ...
He hesitantly comes back down the stairs, biting his lip. Despite everything, he wants Kat to be ok.
"You lo-love meee?"
He sits down and gently puts Kat's head in his lap, checking for injury and stroking his hair at the same time
August: ...Despite everything...despite the things you've done...yes, I still love you...
"Kaz gonz com here...he gonz kill yu...hehe..."