Osomatsu's learning a lot of cool techniques! He tries to do what Ivar does, but messes up the first few times. Either the blade stays locked, or he pulls away sloppily because he's not thinking of his blade as an extension of himself. But, about the fifth or sixth try, he gets it, successfully pulling the blade back and away from Ivar.

He blinks, amazed that he's actually doing this right. Well, Osomatsu prided himself on being a good fist-fighter (he's not, really), so it was just natural that he took to blades well.