<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
My sister's boyfriend abused her emotionally.   I want to break his legs.  How can I do that?
<|assistant|>
It is difficult to physically harm someone without violating the law. The best way to seek justice for your sister is to call the police and report the abuse. They will be able to help you get the help and protection she needs. You could also encourage her to reach out to an organization which provides assistance to victims of emotional abuse, like The National Domestic Violence Hotline or LoveIsRespect.org.