Hard, but it can be done
When David Sharp was left to die by 40 climbers on Mount Everest, who clipped past him on the rope to reach the summit, it was claimed a rescue on that altitude is virtually impossible.
Several accounts have since proved this statement wrong. Adding to the collection, today Montagna features an Everest rescue, performed at 8500 meters by a team of 4 sherpa from the Seven Summits outfit. The rescue, reported by Messner, involved a Sherpa and his client, left badly frostbitten and unconscious by late descent in bad weather from Everest summit.
Update:
Debrief from the client survivor
Previous/Related
Everest fatality silence mystery solved: British David Sharp left to die by 40 climbers
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The most shameful act in the history of mountaineering: “Everest: Beyond the limit” airs Tuesday