Your option 1a is exactly what happened, so to say very unlikely is ridiculous. The airman didn’t hear him at first, even the witness substantiated this, and just heard the hard knocks on the door. The officer visibly obscures himself after announcing himself the first time - something many home invaders do. The airman called out to the police (while the officer was walking around the side of the unit) and the officer never answered, prompting the airman to get his gun.

Having your own gun on your property is not grounds to shoot someone, otherwise the 2nd amendment is null and void. The cop was suppose to give instruction and then shoot if the gun is pointed at him. It’s very obvious the cop is wrong and I’m not sure if it’s like some PTSD instinct to completely disagree with the majority or most people, but there’s no denying this. The cop was wrong, as hell. People from all party lines, age, careers, and other demographics that all agree on this.