This is how this should have gone down:

Concerned Citizen: "Hi, 911? Yeah, um there is a guy walking around with a gun."

911: "Ok, what is he doing?"

CC: "He's walking around with a gun on his hip."

911: "Is he doing anything suspicious?"

CC: "Yeah, he's walking around with a gun in a holster on his hip."

911: "That's not illegal. Goodbye."