Situational Awareness, mindset, and training.
Don't know how much this Firby had, but facing a punk totally untrained scared kid probably made this outcome what it is.
From Kid,
Second, how many of us would wish to face down a shotgun, at close range, with only a pistol, be that pistol a .380 .acp, as in this case, or even a .45 .acp?
I wouldn't wish to face any firearm, but I carry a Kel-Tec P3AT .380, usually with Cor-Bon, or Speer, and would react to the threat the same whether a .22 or 12g.
An opportunity presented itself and Firby reacted. Fortunately, to his advantage.
Don't know about the press conference being a "stellar" idea, but that was his choice.