There is the bully. These people may be bullying the person right in front of them or behind their backs. They are the main abuser.
There is the one who is being bullied. These people are being picked on and abused. They do not fight back, if someone does fight back it's not necessarily bullying. They are the main victim.
There is the assister. These people don't start the bullying but they also bully the victim. They could encourage it or join it.
There are the reinforcements. They don't directly get involved with bullying, but are like an audience. They support the bully and cheer them on.
There are the outsiders. They stay away from the situation and do not defend the victim or support the bully.
There are the defenders. They come to the victim's defense and speak up for them, comfort them. They support the one who is being abused.
I think the answer is : Negative feedback loop
Example of a negative feedback is when your body temperature somehow increased because of the weather, your body will create sweat to lower your body temperature
hope this helps
