when shows such as Cops, World's Dumbest Criminals, or even the TV news have security camera videos of convenience store shootouts, hotel lobby shootouts, parking lot shootouts; or dash camera videos of police shootouts at traffic stops; it is very, very rare to see somebody calmly fire one or two rounds, then stop and evaluate.
What one usually sees is a lot of shots fired, very rapidly, while both shooters maneuver (unless one is still strapped into a vehicle).
Personally, I know that:
1) I have been trained to shoot until the threat ceases;
and
2) I can shoot any given one of my carry guns very fast.
Also, it seems that in many an after-action report, people routinely think they fired fewer rounds than they actually did. (IE, under stress, people shoot more rounds than they might consciously intend or count.)
Now, combine that with the average police hit ratio in shootouts being somewhere in the 20-30% range, which is better than the bad guys' hit ratio but which shows that trained shooters miss under stress, and you might have a wee problem with 5 rounds and a slow reload.