(Page From chapter 9 in vol2) 

Spoilers of ch40 below

The panel on the right will have another dimension now that you know about Black’s condition. Having Prosopagnosia, Black could face difficulties recognising his own reflection at times of intense emotional breakdowns.

Looking at his own self with long hair triggered images of Yaldar, maybe his father, even his mother or Larissa and feeling completely lost towards his identity played a big role in Black’s depression and anorexia in the months that followed.