A person who is attacked by another person is called a "victim." This term refers to someone who suffers harm, injury, or loss due to the actions of another individual. In legal contexts, the victim may also be referred to as the "complainant" or "plaintiff" if they pursue legal action against the attacker.
Concussion.
When a person imitates another person, it is called mimicking or copying.
A person who comes from another country is called an immigrant.
the person is called a chaufer
They'd be called that person's relative.
A person who says one thing and does another is called 'hypocritical'.
When a person is grappling another person it is in the event of when the person is being attacked. Grappling is to dis-arm the attacker if with a weapon or to take the use of their hands and feet away and to overpower and restrain the attacker from further attacking you.
If possible, yes, you should try your best to stop your friend from attacking another person. However, if your friend is attacked first then they will have to defend themselves.
The person who speaks for another is called a spokesperson or a representative. They convey the thoughts, beliefs, or actions of the person or group they are representing.
If written by that person, it's called an autobiography. If written by another person, another author, it's called a biography.
A person from another country is typically called a foreigner or an international person.
Person under control of another is a puppet