Finn was trying out something new. Every other year, she crawled into a compartment with Ducky and Nora, typically joined by Clementine and Molly and Margo and whatever other hedonistic friends they had collected for the year. From there, she stayed quiet and silent and grimaced through conversations she could not contribute to if she tried. At the end of the trip, Nora and Ducky would clap their arms around her and jostle her, like mom and dad proud of their child for surviving another awkward family exchange. And that would be enough to get her through summer.
But Nora had already left Hogwarts and Ducky was being strange and distant. So she had decided to do something very different that year.
She had picked a random compartment. She had chosen a random book. She had chosen a random song on the small music player that had been given to her by Arthur Yorke. And it was this that kept her from remaining completely oblivious to anyone else. As far as she knew, she was alone in the world.
And even though it was sort of sad, at least it was a sadness she had chosen, and not been forced to endure.