What should I do if my little brother is caught by mussels or crabs while swimming in the river?

First of all, you should try to get back to the shore with the help of your partner. After all, it is not easy to see anything in the river. Then grab the other foot of the mussel or crab and cut off the pliers that hold your brother with scissors or a knife. Remember to be quick. Then break the pliers. Then go to the hospital quickly, don't hesitate.