Robby doesn't look at him. He might've, with time--to commit to the offer he's making (one that no one asked him to make), to show that he's earnest about it changing nothing between them. But Mister LaRusso forces him to look sooner than he realises he's ready to: when the face ready to meet him makes his resolve nearly crumble before the question can. Eyes confused, worried as they look back at him, and even Robby doesn't know if he's somehow mistaken to reach this conclusion. Doesn't it make sense?

Doesn't even the man who wants to be his father deserve the opportunity to find some release?

"...I..." Robby struggles to get his words out, to say it, repeat what he's already basically said. He's looking away even with his head turned towards Mister LaRusso, shame creeping up his skin.

"I would understand," is all he can say; quieter than even before, his green eyes meeting with his dad's brown, even if their hold can't last. "I did it to you first."

Because it's all he can say to explain himself, though he leaves it implied what of his past actions he means (but with the clippers there, the subject of blood already brought up--it's not a hard guess to mate).

But his confidence has wavered, and he's worried about what Mister LaRusso might think. If he'll want to take this bonding idea back, or be disappointed that Robby would even think such a thing; that he could think so poorly of the man he wants to take on as his father, when it isn't like that at all.

(Or is he worried that the problem is really him: that something's happened to him to come up with an idea that would shock Mister LaRusso like this, and this is bad, that this isn't like him at all?

He doesn't know.

He doesn't want to be broken.)