Somehow I don't think that standing up and running around in a blizzard would have helped them in any possible way. Perhaps during the lulls, but that would produce sweat, and an even surer death, right? Continuing to make progress 'down' might have been more helpful, but it sounds like they waited even after the storm abated, and were probably quite soaked.

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ad - they did exactly the wrong thing, lying there and shivering all night. If they'd got up and run in circles all night, they likely would have stood a much better chance of surviving.