My first reason is that he risked his life to save his fellow climbers. Once he reached camp IV he gathered some oxygen and water he set out to find strangling climbers. He was slowed by the storm, and still managed to end up saving two of the three climbers that were almost frozen to death or already dead.
My second reason is that he is a very experienced climber and has been doing it for many years. He has been high altitude climbing for over 20 years. He has summited everest 3 times and each time was without oxygen. This means that he knows what choices