When I first watched the video, I heard the gunshot and saw a large orange plume simultaneously. My first thought was “What kind of gun does that????”
Seeing a still shot of the moment a little later, I realized the plume was the bear spray. The victim had obviously sprayed the thug when the gun was pulled on him.
Self defense that, sadly, didn’t work.
He used what he had to defend himself. It probably prevented the guy from getting off a second shot, but unfortunately that wasn’t enough.