They're probably inches from each other when they finally wander past, closer perhaps than they are even when they used to intentionally walk together.

But Sasuke's sound makes him huff loudly, glancing across at his friend and then turning his head away completely.

If Sasuke isn't going to say anything, he isn't going to say anything either. He definitely isn't going to look back over his shoulder either.

Nope, yes he is. Only for a moment though, just to check, but Sasuke's still walking away from him.