"The benefit of this one is speed, not strength," the Soldier begins, drawing a knife of their own that's about the same size and shape as Sora's.

Then the Soldier walks Sora through a different way of holding the blade than he's done before: not point first for stabbing, but the point away from his body, for slashing. No touching still, because they're not up for it and maybe Sora isn't either, but with plenty of demonstration and slowing things down for proper understanding. The Soldier is, perhaps surprisingly but perhaps not, a pretty damn good teacher, patient and thorough. They shed another jacket in order to more accurately show body and foot positioning, show the grip with both hands in case Sora is more comfortable with his left, and repeat the slashing motion in slow motion multiple times.

All they're doing now is the new grip and one motion, but they make the kid practice it until he has perfect form and can do it at speed five times in a row.