main arteries/viens lay in the legs, in fact, a swipe to any old artery there would cause death within 15 minutes if left untreated. a GOOD soldier would probably cut the arteries on both legs meaning about a 7 minute bleed out.
oh, and unconciousness in about 30 seconds to 1 minute.
a cut to the jugular is NOT the most fatal. the artery (can't remember what it's called) would cause death in less than 30 seconds (due to no blood to the brain)
also, due to FUBAR hitboxes, it is actually the back.
Most fatal knife kill I belive is stabbing in the back at about right next to the spinal cord, then twisting, kills the person instantly, or paralizes everything in there body so they die in a couple seconds, what your doing is splitting the vertebrate apart, causing the body to lose all control, and the person simply dies, or is therfore put into a coma for about a minute and dies ot the lack of blood making it to places around the body, mainly the brain, it isntantly paralizes you. Most common place to aim is about should height, or a little lower, gets a good spot so that if you do screw it up, sya not close enough tot eh spine, you hit those organs that are vital to you living.Or a simple way to kill someone, break there neck.
It's essentially what this is, just this is a little fancier, and not as hard to do. Plus that loud CRACK is gone of his neck shattering.
(Kids, don't try this at home or anywhere else for that matter) Wouldn't want anyone splitting there jammies now would we.
Oh and to keep people from going "Well hows he supposed ot get behind him, uh huh?" Well simple, it's not intended for a frontal assault, no knife skill is intended for a frontal assault. It is intended for a kill that is silent and quick, so for those missions of secrecy and covert means. Killing someone without a bullet, or a sound. I actually see no point in kives in this game, all people think is it looks cool to do it, and it makes you look stupid when your chasing a guy in circles while he's shooting you.