It’s not as consistent as your point about the silencer but also people absolutely both can 1) keep going after being shot, getting hit once and instantly, silently, being down for the count isn’t that realistic and 2) a lot of people haven’t actually experienced real pain to understand how bad real pain is you don’t get shot and just suck air through your teeth tie a piece of fabric around it tightly then act totally normal, pain can be physically and mentally disabling, especially after a few minutes and the endorphins wear off. I understand shooting people to have them fall down and start screaming bloody murder while also trying to scramble to shoot you back isn’t necessarily good story telling but if it was part of story telling I think a lot of shootings would be skipped in plot lines