I appreciate all of the comments from others on statutes and cases. I have a few anecdotes, as earlier in life I lived in some sketchy neighborhoods. I've always thought Cooper's comment that if you did not have a firearm within reach while reading, you didn't understand the lesson. My personal take on the video is yikes! I sure hope the opposite apartment was unoccupied. That could have been catastrophically tragic.
I had a cinder block through an apartment window(ground floor) on a night before Thanksgiving. The eyes of the thrower(I believe) about popped out when he saw the muzzle of a .45 Commander. He moved so fast it was a "disappearance". Another drunk tried to get in a girlfriend's apartment where I was. Yelling, threats, banging on the door,etc. Same Colt Commander, but my shouted statement of being armed and would shoot seemed to get through and he wandered down the street to be arrested in a few minutes, city being called. A fight in my apartment hallway slammed into my door. It held, but I was at "gun up", down the hall.
Almost two decades ago, with my youngest, went to the gun when what seemed like a violent lover's quarrel was occurring predawn outside our hotel door. That just seemed to fizzle out; no breach of the room door. And finally, an office mass murder during a weekday near my house, prompted me to go home to wife and infant, break out the personal carbine and wait. The shooter had been clearly identified by clothing, and I had mentally made the decision to engage if a similarly dressed armed individual had approached.
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HCM point about bullets going both ways is well said; I recall instances of LE personnel being killed by being shot through walls, so for damn sure that's something to consider. Given that, a defender might consider not continuing to shout commands, police being called, etc. and just go to cover and wait. Curious: any thoughts on "warning shot(s)" at base of door? Try not to flame too much...