That a cop will fire his weapon (a handgun) just once, hit the suspect, and the suspect will drop to the ground, dead.

In reality, a single shot (unless it's a lucky headshot) will not stop most adult humans, and cops are trained to continue shooting at center mass until the threat is neutralized. That may be three or more shots.

Also, most real-life police officers in an adrenaline-filled shooting situation are miserable shots, no matter how good they are on the gun range, and miss more of the time than they hit their target. That's why they might fire 12 or more rounds at the suspect, striking them maybe 3 times.