That direct refusal takes Tonbokiri aback. He can respect it-- but it overwhelmingly fills him with another blinding flash of anger.

With supernatural speed he dashes at Arisato, his spear set to deflect Arisato's sword hand, one palm extended, intending to knock the boy flat on his back.

Even falling on top of the boy, he is careful to not press down on him, but he does pin the boy's arms to the ground and brings his face close.

"Why do you refuse?" The anger in his expression changes to frustration. "Can you not see how concerned I am for you?! Yes- you have gotten stronger with your sword. But it is not enough!"