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So if you develop a problem at that altitude the answer is to get down fast. Are you on your own? You will rely on your most capable Sherpa but if you need more advanced evacuation how is this handled?
If you collapse high on the mountain you can't be rescued. Case in point the 96' Everest season. Rob Hall, an outstanding guide who had summited Everest 5 times, had a client collapse just below the summit. Even with another guide present, Andy Harris, they couldn't do anything for the guy. Too dangerous and likely futile. Rob refused to leave the client and died himself.
Another great book is K2 The Savage Mountain by Charles Houston. Documents the 1953 K2 expedition where the whole team attempted to bring down one collapsed comrade. It's a great read.