"Well, you'll be having neither until you learn to behave. I recently earned you bit someone. Which makes two victims already. You won't be fed for a week either."

Truthfully he didn't know what to do with her. Killing or hurting her may attract unwanted attention from the colonel as well as Urahara, which in turn would result in a penalty on him if they believed her to be the innocent she came off as for the most part.