The Miyoshi brothers have powerful regenerative capabilities.  They say that taking life is offering salvation, and in them Shungiku sees his own younger self.  Oooka, who knows the old Shungiku, is doubtful he can win the battle.
I'm sure the first murder was terrifying...
El primer muerto fue aterrador, ¿verdad?
Fue muy difícil matar 
al primero, ¿verdad?
Tenho certeza que a primeira 
morte foi aterrorizante...