He stops, his head turning slightly as Raph speaks. Try and stop you... he already knows that's not going to work in this lifetime. It never has, and it never will. He's annoyed with his brother, and he can't help that, but he knows exactly why Raph wants to come along. It's not about fun and games anymore.

It's about saving Leo from his own foolish, trusting nature. He can't help that, either.

He's annoyed, but he can't be mad. It's good to know someone is watching his back. Everything that happens on this mission... he'll just have to remember that his brother always comes first. No matter how big of a pain in the shell he is.

Without a word, Leo heads off towards the window, slides it open, and slips out into the darkening sky. He doesn't shut it behind him.