Just a side point for those who don't know... A human body has a lot of soft tissues. Believe it or not, most people who are shot survive with minor injuries. When a person is on drugs or adrenalin is running high, such person may not feel/realize that he/she has just been shot, and therefore continue to act for many seconds like nothing happened. Police officers are aware of this phenomena, and if it comes to the use of a deadly force to stop someone they will continue firing until that someone is stopped. Also, some shots can miss. That's why most of the time we hear about multiple shots fired by a police officer.
I once was at a shooting range and saw UN security officers participating in some sort of training. I spent a few minutes observing. Once they got OK to fire, they all aimed at their targets and shot multiple times. I observed similar practice patterns among other types of officers.
Unless you shoot someone in the brain or impact a part of their central nervous system they will still be able to function.
The amount of their ability will be determined by the already received gunshots and the damage they have done. So you could blast somebodys arm off with a .12 gauge and still be killed from strangulation by their other. Also depends on their amount of mental toughness. Some can continue to fight with great damage done to the body. Drugs and alcohol can increase their durability. This is why police are taught to shoot center mass and keep doing it until threat is either stopped or dead.