Oh, Ivar is encouraging Osomatsu to stab his brothers. Careful, Ivar, don't give Osomatsu ideas. He laughs and tries to flip the blade through the air, but he gets scared of catching it wrong and lets it drop to the ground instead. Way to go.

"Thanks for the lesson!" he says as he picks up the dagger. He's just trying to gloss over the fact that he did something incredibly stupid. Oh, and payment! He's got cash that he hands over, too. "I'll be sure to practice on my brothers."