Mary swung hers around in an arc. She might have been practicing with it at home a little. After a moment's thought, she locked the compartment door with a flick of her wand before tucking it back into her robes.
"You do realize we're going to get mocked terribly if anyone finds out about this." She smiled at him and touched her light sabre toward his. "And alright then. You can be the villian and I can be the good girl. Oh wait. We already did that." The light sabres connected with a little spark. Shamefully it wasn't nearly as good as in the movie.