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.
But if you die before you can, 
wouldn't that be it?
Pero si mueren antes de 
hacerlo, se acabó, ¿no?
Pero si la palmáis antes, se 
acabó lo que se daba, ¿no?
Mas se vocês morrerem antes
 disso, do que adianta?