“I would have blown him away without any hesitation.”
And how would you have felt about killing someone who was only trying to summon you because your son was in trouble?
I would also say that “banging on a door” is not the same as trying to force the door open.
I would also say that while you opened the door and showed your weapon you didn’t immediately shoot the guy in the face. Perhaps if the man in the story had done that we wouldn’t even be having this discussion.
And how would you have felt about killing someone who was only trying to summon you because your son was in trouble?
How could a dead man inform me of the information he had.
If you are not pointing a pistol at the culprit, you deserve what comes your way if he attacks you.