Frost Bite

The recommendation is that if you CANT rewarm the part, then to leave it frozen. The thawing process will be excrutiating, and once thawed, infection spreads more rapidly than when frozen. Cover the part to insure the freeze doesn't extend further and further, but dont' try to thaw it by rubbing (you'll just do tissue damage) without a fire it will take far more heat than your body generates to re-heat a frozen body part, and you need to ADD heat to the part, not simply keep it warm(ish).