Ah you can make fire without anything but your bare hands and the right natural materials (requiring some luck of course have the right materials available) and a TON of practice before you end up in that situation to begin with. Oh course if your arm/finger/hand is broken instead of a leg ... well then hopefully you're in a warm climate. <img src="/images/graemlins/blush.gif" alt="" />
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Learn to improvise everything.