The thief made the mistake many do, they think that waving around a shotgun will scare people enough on its own. It only works in the victim doesn’t have ‘stones’. This guy a man size pair.
The young man needs to have some good instruction at a good range by a professional. One handed side ways is not the way to handle a hand gun. I have been on the range many times when people that didn’t know what they were doing were shooting. That is always Police day as the general public is safer.