You shouldn't punch teenagers.
Mrs. Jones is teaching a class, and Chris keeps interrupting her.
Mrs. Jones wants Chris to quiet down and let her teach.
Mrs. Jones threatens Chris with a detention if he doesn't quiet down.
Mrs. Jones approaches Chris's desk and punches him hard in the arm.
Chris stops acting up in class because he doesn't want to get in trouble at home for his behavior.
Chris doesn't speak for the rest of the class, but reports Mrs. Jones for abuse and gets her fired.