CNN  —  Jimmy Chin has done many memorable things in his time, but the adventure athlete and Oscar-winning filmmaker is still more used to documenting big stories than becoming the story itself. One half of the creative duo behind “Free Solo,” “The Rescue” and “Nyad,” alongside partner Elizabeth Chai Vasarhelyi, Chin is a star of the mountaineering scene, shooting stills and video of incredible people doing hair-raising things. But when climbing on Mount Everest earlier this year, he stumbled