nb: the stab wound part is assuming a modern day setting; the fatality rate from ANY significant wound goes up substantially if you remove modern medical care, fluids to keep blood pressure up, and antibiotics.
The point though is they don’t kill FAST. Like not in seconds or even a minute or two. Not unless you hit the heart or sever the spine or hit an artery well enough to bleed out asap (cutting throats counts).
THAT SAID they do incapacitate somewhat more often than they kill, but it’s relatively unpredictable. Whether or not someone’s entire body freezes up in shock and malfunctions vs their adrenaline making it so they don’t even really NOTICE until they’ve lost enough blood volume to cause a mechanical problem vs being In Pain immediately…. those are all gonna depend on a huge number of inter-applicable factors that you can’t necessarily predict in advance. And even if the adrenaline part works you may still find that limbs or balance or whatever doesn’t work the way you expect, bc the stab wound had actually severed or otherwise impacted a muscle that was crucial for this action.
So while dude stabbed in stomach by Small Knife may - in a world where he will be taken to hospital and treated with modern emergency and ICU care - well survive, and even those who don’t have the above do have a varying chance of survival depending on luck, baseline health, and whether or not their intestines or stomach were kicked by the blade, stabbing someone in the stomach with a small knife is still LIKELY to make him curl up and fall over either immediately or within a short period.
Or he may be so hyped up it takes several minutes for it to slow him down.
Human bodies and injury are wild in a way: we are very fragile except when we aren’t and survive absolute bullshit; and also we are astonishingly hard to kill until we are made of glass.
So yeah, OP is partly right in that a paring knife is unlikely to be an insta kill on a human being of reasonable health and size, but at the same time that doesn’t actually mean being stabbed in the abdomen isn’t a life threatening emergency or that ON THE WHOLE, if you manage to stab someone in the gut even with a “small knife”, you have a good chance of putting them down ie making them no longer a problem for you.
And the fatality rate skyrockets where fast access to a modern Emergency Department isn’t available, so that doesn’t mean your characters can just shrug off a gutstab.
Second poster is 100% correct about rendering people unconscious tho. There is no situation that the human brain is meant to be tendered “unconscious” outside natural sleep, so it makes it very hard to do and means that ALL abnormal unconsciousness is risky. When a doctor or anaesthetist does it, they’re doing it VERY CAREFULLY with LOTS OF CARE AND LEARNING. And it’s still a risk! That’s why they avoid it if it doesn’t offer a big enough benefit to outweigh the risk!