Help me to understand. I am confused about this outcome?

My brother was attacked by his girlfriend . She struck him in the face and bloodied his eye. My brother in return , punched her in the head. The police were called . But there was little to no physical evidence that the girlfriend had been hit . However it was very obvious that my brother was injured. My... show more My brother was attacked by his girlfriend . She struck him in the face and bloodied his eye.

My brother in return , punched her in the head.

The police were called . But there was little to no physical evidence that the girlfriend had been hit .

However it was very obvious that my brother was injured.

My brother went to jail as a result of hitting her in return . .. . . . . This is the point where I am confused .

Wouldn't she have been the aggressor in this case?
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