Lopsang acknowledged that on the day of this fateful summit push, he suffered from vomiting and fatigue, which Krakauer described as symptoms of overexertion; but Lopsang explained "I have been over 8,000 meters many times, each time I vomit. It is just something I do. It means nothing. I have done it on all successful expeditions, when leading or following. I did it at camp I, II, etc. For me, it has nothing to do with altitude sickness."