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.
...hurt less than a mosquito bite.
ni siquiera duelen tanto como 
la picadura de un mosquito.
Nos causan tanto dolor como 
la picadura de un mosquito.
Doem menos que a picada
 de um mosquito.