Hmmm........not sure why you wouldn't simply finish the choke if you have it locked in - surely it's less damaging and painful than breaking the opponent's jaw? Proper RNC will have the opponent out in <10 seconds.

BTW, It is possible to break someone's jaw from choke positions . I almost found out the hard way, although not from the RNC -

http://www.fightingarts.com/ubbthreads/s...page=1&vc=1
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"In case you ever wondered what it's like to be knocked out, it's like waking up from a nightmare only to discover it wasn't a dream." -Forrest Griffin