Zhou would shrug in response to Urahara's question.  Obviously, he wasn't going to say anything in front of the poor girl.  "Thirteen," Zhou responded.  "At least, thirteen are all that you'll have to worry about.  There is another one, but it's by appointment only and we don't speak about it.  If you prove your worth in Soul Society, and stay alive, maybe you'll find out more."  Zhou was eating his food, blade returned to its sealed state and sheathed, her blood having been cleaned off by the lightning itself.<br/><br/>"You need to find out what else your blade is capable of," Zhou said.  "Almost every blade has certain abilities that are unleashed as you grow in strength.  Mine, as you've seen, enhances my speed, projects a protective aura around me, and can extend itself in the blink of an eye.  And that's only at the Shikai level.  Your father's zanpaktou is terrifying.  Byakuya's Bankai is a terrifying thing that brings opponents to their knees with ease."