His death...

It's night, Fyodor got stabbed by something inside the helicopter, and got covered by many blood, and while Chuuya and Dazai was outside, when the helicopter was about to explode this is his last words:

Fyodor: "Bozhe, Bozhe, pochemu, ty brosil menya?" He said with Russian language, he just smiled and accepting his death and then he remembers you

FYODOR FROM BSD ANIME