[ He may have been offended by Leo questioning his taste in food if Sano didn't speak up.. that's two things at once too many to get offended over, and despite being released (he has to rub his neck a little for a moment) his jaw is practically hanging on the floor at the word "apology". ]

I'm not gonna apologize..?! [ He sounds pretty incredulous at the very idea of it, let alone actually.. doing it.. ] I was just doing what I thought is right! In case all of this was about to end a lot worse!

[ There is it.. the stubborn part of Shinpachi that clings to his own ideals and way of thinking as either an adult or a child depending on the severity of the situation. ]

That guy's gotta understand that too, right?!

[ "That guy" being Leo.. because okay, fine, he'll acknowledge it's a.. turtle.. person.. talking turtle. Whatever. But without a name that's the best you're gonna get, bro. ]