Two questions, then -- one, if someone's renting their place of residence, do they still have the right legally to tell someone to get off "their" property? Where does that right extend to? If someone were, say, lurking outside the apartment door or sitting in the parking lot waiting for the inhabitant(s) to leave. The landlord does not live on the premises.
And two, if the victim did need to call the police due to the abuser testing boundaries and showing up uninvited in spite of a letter (which the victim has retained dated copies of, of course), what would be best to say to the police to inform them of the situation? Ideally to reduce the risk of someone getting shot as much as possible, because these people do live in the USA. ^^;