and depending on how you articulate your position to the cops when they arrive, you'll spend at most an hour in cuffs while the prelim investigation is done.

"I was faced with an erratic dude with a weapon and genuinely feared for my/my family's life"

Two schools of thought when dealing with cops. First is the general do not talk to or cooperate with cops. The second is carefully talk to/cooperate with cops and then shut up. While I'm generally in the don't talk to cops type, the second one would apply here.

Two good vids that are worth the watch:

Don't talk to cops: https://www.youtube.com/watch?v=d-7o9xYp7eE

Carefully cooperate with cops in a self defense shooting(I'm not a huge Ayoob fan as he is occasionally one of the some animals are more equal than others type people, but he is spot on here): https://www.youtube.com/watch?v=zIJ4wLP_0UM