[Well, he doesn't exactly want to stick around and pry into what exactly he made her think about. They still aren't on the best of terms, and aren't like to become so in one afternoon, so he simply nods acceptance of her words and steps aside to allow her to pass and continue on her way.
He doesn't step very far. His shoulder hits the barrier and the movement comes to a quick, abortive stop.
And his demeanour, calm and polite though it had been until this point, becomes suddenly sharply focused and intense. He slides his hand against the barrier, tracks the motion and-- looks up.]