[Eric in the Ozarks]

Charley Taylor was just closing his restaurant/bar in Urbandale, Iowa when he observed a young looking man in the parking lot roll a ski mask over his face. Thinking he was about to be robbed, Charley picked up his Hi Power pistol and slipped out the back door.
As he approached, the robber turned toward Charley and fired two shots from a .22 revolver. Unharmed, Charley let go with three rounds of 9mm.
The suspect dropped his revolver and ran toward an idling Impala. Charley emptied the magazine into the back window and truck of the Chevy, just as a passing Urbandale cop cruised by.
The cop found the perp crying on the front floor of the car. Amazingly, no one was hit with the more than a dozen bullets having been exchanged.
The next day, an Urbandale detective stopped by and invited Charley to visit the Urbandale police firing range for a tune up...

[BCW]

one never knows what their reaction is going to be...facing the possibility of taking a life while protecting another is highly stressful...in a society like ours - we are taught to value life (becoming less common I know) - and when faced with a determined enemy - one has to go against those natural feelings...but lots of training and drills do help...