Hello everybody!
I’m looking for a movie with little boys, maybe teenagers. They seem to have been in a boarding school and there was a stage with preparations for a theater performance.
They were also traveling by train, and one of the boys tried to kill the other boy.
I also remember how one of them wanted to hit the other with a wooden sword!

The title of the film also seems to contain the word “Sword”, if I’m not mistaken.