Just so, the fear leaves her face, but the caution remains. He isn't talking to her like he means to hurt her, which is a novel experience by itself--but it also leaves her with uncertain footing. She doesn't know him, and that means she should be wary of him; but he's also clearly trying not to frighten her. It's a strange combination that she doesn't yet know how to handle.

And what he's saying makes sense. She'd seen other people getting off the train, hadn't she? Maybe he'd been on it, too. She glances around, and then raises one hand to gesture around them, questioning: does he know what's going on now?