Wyoming, Tetons, Symmetry Spire (2). On July 15 John Biehn and Albert Sickler (31) had completed a successful ascent of Symmetry Spire and were descending via the Symmetry Spire Couloir. They were glissading down the snowfield when Sickler slipped and fell. Sickler dislocated his shoulder during his attempt to control his slide. Biehn immobilized the injured arm. They were able to complete the descent without additional assistance.
Source: George J. Kelly, Park Ranger.
Analysis: Party members were not fully aware of the dangers of glissading without the protection of a rope.