ginshi shirazu

http://kissmanga.com/Manga/Toukyou-Kushu-re/1-Read-Online?id=209986 On chapter 1 page 2 there is a interesting pannel of shirazu screaming exterminate ghouls over and over and also saying urie is the only one I will not loose to. Before when I seem this pannel I assumed that it was just...

I mean like seriously. Now that we've seen how Saiko fights we know that she was the one who defeated Nutcracker, I don't care if it was some kind of collaboration or what, it's painfully obvious that Saiko was the one who knocked her out. So, my question is this: why did Shirazu get her...