bds32 pegged it. If you do "real life" practice, PLEASE do it under the eye of professional instructors at a closed, professional course, competition, or class.
As for Jerry, he's a shooter, not a gunfighter. I think ANY of us, in a real gunfight with lead flying and adrenaline pumping, would probably have hard time hitting a bus, much less a human.
There's just no way to practice 100% for the real thing unless it IS the real thing.