Having his hand free was a start. The defender freed his strong hand, reached for his firearm, and drew almost simultaneously as he looked to the left--an obvious reaction to an external stimulus.
Even then, it was a close call.
A couple of years ago, a couple came home in a good neighborhood and carried groceries from the car to the front door. Immediately upon entering their house, they were put on the floor by a man with a gun, who fortunately only wanted money and valuables.
The victims were not armed, but if they had been, it wouldn't have helped.
The crook, who had a long record, had been checking out other houses beforehand.
"Situational awareness" means noticing who may be following, noticing the cars parked on the street, noticing anyone on foot within a distance of perhaps 75-100 feet, and being alert for passing vehicles.
ALL THE TIME.
That is not "living in fear." It has no penalty. It does not imply an expectation of danger. It is simply prudent.