"Sure." He smiles a little, a crooked twist at the corner of his mouth, and finishes putting his earbud back in. And then, for all intents and purposes, his eyes go right back to Facebook, and certainly his thumb flicks up along his feed like he's reading it. But his eyes flick over to her every so often, too - it's less out of any real suspicion than it is keeping an eye on anyone who interacts with him. You don't get as far as he has in what he does without being aware of your surroundings.

Two stops later, he gets up and 'excuse me's past her to get out into the aisle. "Hey," he adds, almost as an afterthought, "good luck."