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You compared OP to a soldier acting in circumstances that require bravery and possible sacrifice of life. What OP did (in his fantasy version) was not brave in the least (and if he were a soldier, he'd be facing court-martial at the very least).
No matter how much you feel compassion for OP, the fact that he shot through a closed door simply cannot be ignored. Forget whether it was premeditated. He shot through a closed door not knowing who was there (not hearing a gun *advertiser censored* or a verbal threat), without any weapon of any kind visible to him, four times (not once, not twice, not three times...four times).
Nothing at all courageous about that. It's cowardly and breaking all the rules of a responsible gun owner (add to that, running and jumping around on this stumps with a cocked pistol, per his own words).
Oh, and let's not forget...there was 29 year old woman, unarmed and defenseless, standing behind that door who's dead now.