Reminds me of a scene from “Crocodile Dundee”.
That orange cap on the end of the barrel was a dead giveaway.
Wrong Wrong Wrong. You don’t pull out a “big gun” and chase robbers away. You blow the sumbitches to smithereens and call the cops to bring the body bags. They will be back and this time all four robbers will have real guns. They ain’t gonna be dissed by a store clerk.
The clerks errors are twofold.
1) He did not kill the armed robber(s), thus giving them another chance to rob or kill innocent people.
2) “His gun was fake? It looked real to me, officer. I wouldn’t have shot him except he said he was robbing me, was pointing his gun at me in a menacing fashion, and I was in fear for my life.”