Manabu grimaces a little, but more than anything, he looks a shade confused by her reply. Gosh Manabu Yuuki, if you expected someone to chastise you for your remark, why'd you say it at all, hm? But that aside, he...doesn't really get what she's saying.

"Umh..." He rubs at the back of his head. At his feet, Magnet growl-whines and paces around. "You mean, like...with blood-powers, or something?" Why else would anyone be cutting anyone?