[It's a good image, good enough for him to be able to let her go. He lets his hand linger on her arm for just a beat before pulling away completely, and by now there's not much left to say. That smile is getting harder and harder to maintain and perhaps it is for the best that he leaves before this turns into something more.
This is good, this is all he needed and hopefully it won't be the end. But if it is... it's okay. ]
Goodbye, Saya. [And with that he takes a few steps back, hand raised in a reluctant wave. A few steps more, and then he turns his back to her, steps heavy and hurried as he walks away.]