Prosecutor. I've not had to watch anyone die in person, thankfully, but I've seen my share of videos and pictures.
I feel even worse for the military and police men and women around here.
And:
Well, I see what you are getting at, but it's mostly not true. Being shot is traumatic, no doubt, but it usually manifests as a blunt force for most people. They often react as if someone punched them. The bullet hit makes them turn, or startle them, and sometimes they fall... but it's certainly not the "fall-over-dead" limp thing that you see in television or old Western movies. People that fall are usually still alive too, and will look around, get back up, try to crawl somewhere, or try to fight back.
If you watch police videos of shootings, it usually takes 5, 6, 7, or more shots to kill. And all that time, the guy (gal) is moving around, yelling, fighting back.
It's quite unpleasant.
I get what you are saying, the animation is lame. However, the limp ragdoll is not even *close* to what death is like.
In a fight, if they know you're going to kill them, they might turn as if to run but if it's already too late you might even get the same thing in real life. It does take a couple of seconds for the brain to realise the body isn't working any more. Unless you shoot someone in the head and destroy the brain completely, I doubt that any death is really instant. The brain will continues to work after the heart stops until it too dies of oxygen starvation which is why you have about 2 minutes after someone's heart stops to restart it again before brain damage sets in.
As a complete guess, stabbing someone in the heart causes shock and along with the pain, causes the person to pass out. If they didn't, they would still be able to move, maybe far less quickly though, even though the heart has stopped completely.
This has been proved when a doctor held up a head after a guillotine cut it off and asked it to blink twice if it could. It did, proving that the brain was still alive and could still hear and see and understand what was happening. So, even cutting off the head doesn't mean instant death as most people thought it did. Imagine the pain the brain must be experiencing until it dies, that's enough to make anyone cringe.
I have seen someone die in real life and it's not something that I'd ask anyone to watch.