BOWIE, Ariz. — The rescuers had rappelled from a helicopter, swaying in the brisk April winds as they bore down on a cave 7,000 feet up in a rugged desert mountain on the edge of this rural hamlet. There had been a call for help. Inside, they found a jug with about an inch of water, browned by floating leaves and twigs. They found a woman, Christie McNally, thirsty and delirious. And they found her husband, Ian Thorson, dead.