Why does a bullying act that way?
They might had a bad day. Maybe some of them didn't get enough sleep. Bullies may be going through something at home. Sometimes it could be the cause of anxiety or sensitivity. They probably didn't get to eat breakfast or get enough to eat.
There can be more reasons why bullies act out.
1.) Not popular
3.) To be powerful
4.) They feel insecure
5.) Escaping problems