Bad move, chummer, real bad move. I'd made it maybe 100 of those 500 meters when I put a foot wrong, turned an ankle, and did a classic one-and-a-half-gainer to land on my neck and shoulder. My injured shoulder, of course. I did what anyone would do in that situation—I screamed bloody blue murder, as I did this graceful skidding roll down the loose scree slope. After what seemed like a frag of a long time, I came to rest upside down against a car-sized boulder.