Okay kiddo, imagine you're playing a game of tag with your friends. Your friend gets tagged and they're "out". But sometimes, some of your friends don't want to be tagged and they try to run away from the person who is "it". That's when the "snatch squad" comes in.
The snatch squad is a group of people who are really good at catching kids who are trying to run away. They come in when someone is being really difficult to catch, and they might get a little bit rough to make sure that person doesn't get away.
But don't worry, snatch squads aren't bad guys. They're usually the police or other people who are trying to catch someone who did something wrong. They have special training to make sure that they can catch people safely and without hurting them too much.
So basically, snatch squads are like the extra help you call in when someone needs to be caught but they're making it really hard to do so. They take care of things in a way that regular people can't, so that everyone stays safe.