He doesn't budge, biting down on his lower lip.

Then, in an instant, he's on his feet, noticeably more cheerful as he gives her a curt nod.

Opening his mouth as if to speak, he pauses, as though thinking better of it. Whatever he originally intended to say, what comes out is an almost exaggerated, "Take care."

There may or may not be a double meaning in there, it all depends on how she chooses to read into it.