1. Inform the cops. Give them the info & evidence, and let them decide what they're going to do about it.
2. Get out of state. Yes, there will be issues - cope.
3. Arm accordingly. If he still shows up, the cops haven't done their part, can't do their part, and he's seriously motivated toward harm.
Even if the request was a "troll", I don't see how such an answer can really be abused.