User blog comment:Xilinoc/Ch. 593 - Marching Out the ZOMBIES 4/@comment-2211792-20140821171436

I'm starting to suspect that Giselle's blood is less magic and more science. As in, "the Zombie" turned her blood into a medicine not unlike Mayuri's drugs. If that's true, then Mayuri can actually come up with an antidote that will revert zombification and save Giselle's victims. Maybe that's why Kubo matched them up against each other.