"Oh no.."
August: Yeah...so I...I need my arms and legs...mi amor...
"Yes..what about your fingers.."
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.