If you were following along, you know he racked the slide while still inside the house, you could hear it on the audio recording. He racked the slide, told the dispatcher he'd done that (or confirmed that the sound was indeed that of a shotgun) and then went outside. After a short interval, you hear, "Move and you're dead", followed shortly by the "boom" click-clack "boom" click-clack, and a short interval of nothing followed by the third "boom" click-clack. Being as it was the middle of the day, the perps had sufficient opportunity to see that 3/4 inch hole in the end of the barrel, and decide not to move, instead they apparently rushed the guy.
Yes, I was following, if we heard him work the action outside, then they could have as well. I know at least one of them heard the action the second time. The third discharge is the one that would indicate at least one of them was running.
If they were rushing him, one of them would have likely got to him. 15 feet can be closed very quickly. He said, “I am not going to let them get away” and he didn’t. As I said before, a sane and sober man is not going to rush a riot gun. If there are more than one, they are going to get you at 15 feet. But, it’s roulette, neither of them knows which one will catch the blast and I am thinking neither is going to be eager to find out.