Some Bullies may feel relief whilst others may feel anger.
My friends think bullying is dumb and shouldn't happen.
Bullies bully to feel better about themselves. Every time they put someone else down, they get a boost of self-esteem. However, this boost does not last long and bullies go to find another victim. So yes, some bullies can become addicted to bullying and getting the boost of self-esteem.
The person who bullies feel more powerful than the person being bullied.
Usually a person bullies another person because they are insecure or they want to fit in or be "cool". After a bully bullies someone, they probably feel complete, cool, and like they are better then the person they just bullied.
There are plenty of bullies.
Bullies as a need for attention.
I'm sure that some do well others don't. They may enjoy what they do; if the person being bullied gets hurt or injured, though, the bully may feel bad. The bullies feelings may be of guilt or enjoyment.
b u l l y
Team bullying is when a group of bullies commits bullying on one or several victims, rather than there being only one bully. The group of bullies generally have a leader, and the rest back him up.
They may see it as a way of being popular, or making themselves look tough and in charge. Some bullies do it to get attention or things, or to make other people afraid of them. Others might be jealous of the person they are bullying. They may be being bullied themselves.
Bullies, same as physical.
Bullies as a need for attention.