MP - great training methods! Live dislocation practice with a turkey!
To partly answer the question, you can crack vertebra by snapping the neck sideways violently if you catch someone by surprise. You can dislocate vertebra by elongating the neck if you catch someone by surprise. However, both of these things will not necessarily result in broken vertebra and broken vertebra will not necessarily result in a broken spinal cord which = death.
If the person is not surprised and tenses their neck muscles all the above are much harder unless you're scary strong. And even then it's hard to do. Sure, you can seriously damage someone's neck, but killing them with a neck break is very hard.
You know the movie neck break that I like best? It's the one where the guy lowers himself quietly from the ceiling and wraps his legs around his victim's head and snaps the neck with a quick thrust of the hips!
Breaking a neck is very hard indeed. Just learn the Vulcan Neck Pinch and use that instead.
"i can barely click the link. but i way why stop drinking .... i got ... moe .. fcke me ..im out of it" - GDA on Traditional vs Modern Wushu
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but what if the man of steel hasta fight another man of steel only that man of steel knows kung fu? - Kristoffer
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How do you think monks/strippers got started before the internet? - Gene Ching
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Find your peace in practice. - Gene Ching