Somehow, he still had some legs left.
"My plan was to go up one time," Jornet told The Associated Press in a recent interview in Barcelona, just south of his native Pyrenees. "When I was going down, I was like, 'Hmm, we could have some days before we leave' ... I wanted to try to go back up again."
So the man who has helped nurture high-altitude running from obscurity into the forefront of extreme mountain sports set out for a second solo ascent in a six-day span of the tallest peak in the world.
By May 27, Jornet had recovered quickly enough to make a second ascent from an advanced base camp, at 6,400 meters. He reached the summit in 17 hours, only 15 minutes slower than the record set by Hans Kammerlander in 1996.
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Only about 200 climbers have ever made it up Everest without the use of supplemental oxygen. Before Reinhold Messner and Peter Habeler did it in 1978, it was thought to be a guaranteed death. Only about 20 have ever done it twice.
With or without supplemental oxygen, Everest remains one of the most perilous places on the planet. Nearly 300 people are known to have died on the mountain. This year is proving particularly deadly, with 10 lives lost through May.
"I could see the pride and exhaustion in his eyes after the first climb," Ballinger, who has climbed Everest six times with oxygen, told the AP by telephone. "The big thing is really to do it twice in one week. I have climbed it with oxygen twice in one week and found it incredibly challenging. This time (without supplemental oxygen) it was devastating."
Jornet, who carries minimal gear, has years of experience running long-distance races in the mountains. He tried it in Everest's thin air.
Long before Everest, Jornet had established himself as one of the premier athletes in extreme mountain sports. He has broken speed records for ascents of Kilimanjaro, Matterhorn, Mont Blanc, Aconcagua and Denali, among other mountains. He has won the Skyrunning world championship six times.
Graced with a small, wiry build that helps him scamper up rocks and dart along narrow mountain paths, Jornet said his main advantage is the ability to recover quickly by checking his pace.
"I climbed my first 3,000-meter peak when I was 3, my first 4,000-meter peak when I was 5," Jornet said. "I have been training since I was 13 every day."
Jornet has also seen how quickly competition can turn tragic. His friend Stephane Brosse plummeted to his death while the two were skiing on Mont Blanc in 2012.
And in 2015, when an earthquake rocked Nepal, Jornet aborted his expedition to climb Everest. He decided to stay and help, however, hiking with two companions into cut-off villages to identify the dead and bring in desperately needed supplies.
"We got covered three times," Jornet said, "one time the avalanche just passed over me, and at that moment I was like, yeah, it could be the last one.