Wyoming, Grand Tetons, Moran Canyon. On 14 July Van Yancey (19) was in a belay position when a test pull from below pulled him from the position and his single nut anchor pulled out. He fell about 20 feet landing on his hands and the back of his neck. He rolled an additional 25 feet down a rock and grass covered slope. Members of the party put Yancey on an improvised litter and carried him a quarter mile to a meadow where he was picked up by helicopter the following morning. The victim was a student in an N.O.L.S. School at the time of the accident.
Source: Robert W. Irvine, GTNP.
Analysis: The belay should have been properly anchored.