 Because some 33 climbers were attempting the summit on the same day, and Hall and Fischer had asked their climbers to stay within of each other, there was a bottleneck at the single fixed line at the Hillary Step.Hutchison, Kasischke, and Taske returned towards Camp IV as they feared they would run out of supplementary oxygen due to the delays.Climbing without supplemental oxygen, guide Boukreev from the Mountain Madness team reached the summit () first at 13