I can believe this. When I was on the police dept. and there was a need to pull the shotgun out of the car, and then racked a round everyone stopped what they were doing and things got real quiet. Most Bad guys know how deadly a 12 gauge is at close range.And, they are G-R-E-A-T for crowd control! I did not witness this, but the story was fresh when I heard it at OPD. This happened during the Black Panther, late 60's era. And "Will",the officer involved, sadly later died of stomach cancer, he always had a remarkable, off-the-wall, sense of humor. I remember him, bald from chemo, working the desk, as he never did want to quit.
When an officer did a traffic stop in West Oakland, they'd come out of the woodwork and surround the cars, hoo-ranging and carrying on. Officer'd call for backup. The "upgraded, enhanced" arrival procedure for backup was to hit the lights and siren a block away and then yank the parking brake and turn wheel to slide in sideways. Whoopee!
Our friend does this, leaps out of his patrol car with shotgun in hand, leveling the gun right at the crowd. Then swings the gun back and forth while holding the action bar release (this allows the action to be cycled, ejecting the shells one by one). He racks the slide to launch shells out, while yelling at the top of his lungs, "How do you work this thing!!? Hey, how do you work this thing!!?"
Crowd goes like - OH SHEET! CRAZY - ***** COP!! Then goes BOOGIE!!, Near instantly vaporizing back into the woodwork, leaping for their lives over back yard fences!
Those days are long gone, and would never fit well with body and dash cams.