After he lost the trail, Jeff King stopped his dog team and draped his sleeping bag over his head to block the battering wind and blowing snow. He was somewhere between the villages of Ambler and Shungnak in the Kobuk 440 Sled Dog Race. Conditions ranged from howling to furious. King lay down with his team. He cuddled a dog named Twister and tried to sleep. That’s when a flaw in the plan rattled his bones. The work of getting there had caused him to sweat, dampness worsened by blowing snow that found its way inside his clothing.