About ten years ago I joined a volunteer mountain rescue group in Colorado.   My new-member training was rough at first; I didn’t take easily to the basic medical and technical skills I would need in order to join the team, and I wondered how well I would handle the inevitable pressure, mayhem and carnage involved in a real rescue. About a month into my training process I left town to compete in one of the biggest adventure races of my amateur racing career: Primal Quest, a ten-day, 500-mile, multi-sport team odyssey in the wilderness areas around Lake Tahoe.   I was a last-minute replacement for a woman who’d been injured in training on a team called Outback Gear, and I when I arrived in Tahoe I met my teammates for the first time.  They had booked us a nice little rental house in a quiet neighborhood near the lake for…