Hypothermia is never far away. When the shivering stops, that's when you should start to worry. It's your body's way of signaling that it's lost the battle to keep your blood warm. But by then you'll be too weak to retrace your steps. Chances are you'll be so confused and disoriented that you won't even recall what it was you were fleeing in the first place. All you'll want to do is lie down in the snow and close your eyes.