Exact same scene as the 2004 short film with the same name (which starts at 11:21).
A naked woman passes in front of Ben (he is fascinated by her nakedness), then the boy notices that the woman has lost her underwear and decides to bring them to her.
John is sent out of class where the headmaster finds him. In his study, he makes John bend over a chair and then, after lecturing him, he canes the boy on his bottom.