@zerimaR you probably figured it out already, but his friend was seeing the middle schooler who died to the birds in Kei, the overlap of their faces because Kei was starting to resemble the middle schooler in terms on not feeling anything from killing living things
Kei has transcended his former self and now has obtained true Chadhood. All he had to do was to pull a Baki and nut to become stronger."Forget celibacy. If you wanna get stronger, do it." -Yujiro Hanma
Kei: *Blows up the berzerk alien's legs*
Masaru: This is fine
Kei: *Blows up the berzerk alien's arms*
Masaru: Yep, nothing wrong here
Kei: *Points at the berzerk alien's head*
Masaru: Yo man, that's going too far.