If Sam notices that she gets on the train and stands near him, he doesn't make any sign of it. (He does, of course, because he'd be pretty terrible at his job if he wasn't on his guard all the time, but he's also very good at pretending like he's not. He doesn't take notice that she, specifically, is there, but of the people nearest him.) He takes his phone from his pocket again and unlocks it, tapping his thumb against the Facebook app on the home screen.

There's no artifice on his Facebook, if she gets a look at the screen while he's scrolling through it. His name, Sam Winchester, is displayed at the top, and he makes no attempts to hide the names of the friends flashing by under his thumb. Every so often, he glances up at the overhead display, and his eyes certainly never settle on a man in his forties with glasses who looks nervous.