You saw an older kid bullying a younger one near the lockers — pushing them, taking their snack, making them look scared. The older kid noticed you watching and gave you a look that said, clearly, say nothing. Later, they find you: "You didn't see anything, right? It's not your problem. Keep your mouth shut and we're fine." You did see something. A younger kid is being picked on, and the older one is leaning on you to stay silent — half threat, half "mind your own business." Telling a teacher means crossing someone bigger who's now watching you. Staying quiet means the younger kid keeps getting hurt and you helped, just by saying nothing.