The human body is an internal combustion engine. We have a finite amount of energy from food and mechanical action. Conversely, there is a classic tale of Inuit hunters seperated from their sleds on a breakaway iceflow. They knew they were helpless and went to sleep. When they woke, the flow had drifted back into the mains sheet. By conserving energy they were able to hike to the sleds. I think no monday morning quarterbacking could change this tragedy much. In a blizzard I'm crawling into my Wiggy bag with my teddy bear and PRAYING.