My sister was hit by her boyfriend and the police didnt arrest her ex. she called 911 and left it off the hook so the operator could her her getting hit.i called the operator and he told me she was very smart for doing that and that he heard it on the tape since he was the one that took the call. He didnt get arrested. my sister swung back in self defense and didnt even make contact. he has no bruises. this is the 2nd time the officer did not arrest her assaulter. Her previous boyfriend broke her jaw with one punch and the officer said they have to arrest them both. I am a concerned brother that feels the law is failing to protect my sister on multiple occasions. the evidence for her is overwhelming. photos, taped phone conversation. yet this guy manipulted and lied his was out of it this most recent time. what are the consequences of me taking the law into my own hands as her larger brother. Is it premptive assault/retaliation? what are the consequences and what can my sister do to protect herself. He bought a house 10 houses down the road so he has easy access. Please help! I want to ensure my sisters safety almost at any cost

