It's good to speak up when someone's doing wrong.
Jim sees his classmate cheat on a important exam but the teacher doesn't notice it happening.
Jim wants to react to seeing his classmate cheating.
Jim tells the teacher that the classmate is cheating and the teacher catches the classmate doing it.
Jim looks away from his classmate and pretends he didn't see them cheating.
The classmate is punished for cheating and learns not to cheat in his classes.
Jim's classmate gets an unfairly high grade on the exam and continues to cheat in his classes.