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Hey, so in this article: http://freeskier.com/stories/profile-speaking-with-tanner-hall-about-his-road-to-redemption/2
Says
In May of 2009, at the peak of his career, on a film session in the terrain park at Stevens Pass, Washington with TGR, Hall overshot a landing and dropped 40 feet out of the air to flat, demolishing his legs. “It was the equivalent of being smashed in the knees by a car going 45 mph,” says Dr. Vern Cooley, a 20-year veteran of high-profile surgeries (like Tiger Woods’), who performed multiple surgeries on Tanner after the crash.