Before starting the climb again, he scanned his surroundings. Ahead of him, a solitary red suit was tromping down the mountain. Pasang recognized Alberto Zerain, the Basque climber on the lead team who had surged ahead of everyone at the Bottleneck. Alberto flashed a zinc-oxide–streaked grin, and Pasang recognized the look: summit glow. “I was thinking, ‘How is this possible?’ ” Pasang recalled. Alberto had soloed up the rest of K2, topping out at 3 p.m., hours ahead of everyone else. Now he was on his way down. “That guy made K2 look easy.”

