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Wyoming, Grand Teton National Park

Wyoming, Grand Teton National Park. On 10 August Greenblatt (19) and Robert Green (19) were practicing glissading in the couloir above Amphitheater Lake. According to Green, Greenblatt lost control. He slid a short distance into the rocks and sprained his ankle.

Source: Pete Sinclair, Park Ranger.

Analysis: Lack of knowledge and experience in glissading.