The point some are overlooking is that the guy with the revolver hit him once, with the first shot, but didn't take him out. The BAD GUY continued firing, and then focused on the LEO who was using an AR-type weapon
We don't know whether the first shooter connected with the other shots, or not -- he felt he hit him with two other rounds, but that was not confirmed. Had the LEO not also been shooting at the Bad Guy, the first shooter might have been in a big mess. Had he taken his AR instead of the Python (or taken it TOO), it might've been over much sooner.
I'm glad our shooter responded. I'm happy he assisted in taking out the bad guy. His presence had to have made it easier for the LEO. But I wonder if our original shooter wasn't more lucky than we know?