 If you have to fight, then you start with your primary and only transition to the pistol after you've exhausted rifle rounds or the distance has closed the close quarters battle. Second, in this case, the armed citizen started out unarmed and had to run to his truck to get his weapon. This isn't unusual simply because most people don't want to carry a heavy and bulky pistol around with them, especially when they're doing physical activity. Let's face it, it's always easier to leave the gun at home or in the car.