It's always the hair. Always. He makes no attempt to protect himself from those sparks, not even seeming to notice when one or two leave momentary burns on his skin. Possibly he's just used to it, though who knows if from here or not. He's equally careful in inspecting the cut, making sure it's even and fair before he's satisfied.

"Human? Sure. I'm assuming that you are too given the kind of work that you do." Sasuke starts gathering the chain for her, measuring by a quick count of links as he goes.