On a warm, spring afternoon not long ago, Chris Davenport was lounging in the sun outside the Gate House at Sugarbush. Davenport, a former world extreme-skiing champion, is one of the most accomplished ski mountaineers in the world, having appeared in ski movies in exotic locations from Alaska to South America. But the day of skiing he had just experienced at Sugarbush had been a particularly memorable one even for such a world traveler.