[He slows his routine and holds Shinji up in front, looking at him while he speaks.]

A progressive knife? So you're a knife that vibrates? [He's not sure what it would mean to vibrate on a molecular level but that doesn't really matter because the point is that Shinji is supposed to be a really sharp knife.

If only they can figure out how to do that.]

So do you know how to do that? To turn extra sharp? You're not a dull blade to begin with, though....