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 heard you guys get really strong 
when you shed your skins...
Me dijeron que si mudan de 
piel se vuelven muy fuertes.
Me han dicho que os hacéis 
muy fuertes al mudar de piel.
Eu ouvi falar que vocês são bem fortes
 assim que vocês se transformam...