The
mind is the weapon, the pistol just a tool.
The guy in the OP had the tool, but NO training. Condition the mind, train, situational awareness, train, state of mind, train, get training by pros, practice, is all for the "mind" to work with the tool. I try everyday, even if not at the range,drawing from desks with snap caps, scoping my house out at night, looking at hallways, angles, cover, safe rooms, entry points, target areas and what's beyond, windows vs. brick wall...etc,..
My wife leaves the front door unlocked after taking the dog out,... I live in a "decent" area, but this world is full of bad people.
I "gently" remind her to lock the door, but sometimes she doesn't...
So as I make dinner, I glance at the door, see its unlocked, go and lock it, run through "What if's" all the time. Where's my nearest safe room? Where's my nearest firearm? "What if this, what if that" all while I cook, read, post here, etc,.. Could I make it to my guestroom/ office from here in 5 seconds or less? Practice retrieving my firearm from closet, desk drawer, night stand,..
All to hopefully make it something my "mind" has done before,
and will do when the adrenaline, fear, noise, tunnel vision, all take place during a critical dynamic incident..(Thanks Rob P.)
"The purpose of fighting is to win. There is no possible victory in defense. The sword is more important than the shield, and skill is more important than either.
The final weapon is the brain. All else is supplemental."
Albert Jay Nock
"Statistically, fighting back is safer than giving in."
Curt Rich
"There are no victims, only volunteers. You volunteer by acting uncertain and afraid. You volunteer by being, as grass-eaters invariably are, unprepared to confront the hazards of life."
Col. Jeff Cooper
Home Invasions are the worst, kicking in the door, you can hardly prepare for that unless you carry in your house all the time.
Sometimes, not practical.....
*** I have had a couple of close calls with my firearm, thankfully, none involved discharging it, could I??? to prevent the injury or lethal assault on myself, wife, or family? Yes.
I have felt the adrenaline rush, had the uncontrollable shaking after, and I didn't even fire a shot. Talking with the officers when they arrived, (wife called 911),..
this is a perfect example why I say.
"a gun does not equal self defence"
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I agree with TAB! 
I will not reply to the insignificant, blanket judgment statement by a problematic poster regarding what "everyone cannot do".