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That target invariably is the expedition leader . The men from Hermosillo thanked us profusely , then went to sit beneath a tree on the side of the road . But as the incident commander , I had to take a step back . " It 's like you're on a roller coaster going down , and then getting shot back up again , " adds Philip Kenul , a pilot . The villagers and rangers would have to hit back . Late in 1998 , two teams led the siege on Tibet 's Yarlung Tsangpo Gorge , a remote and fabled land of icy Himalayan pinnacles and a roller-coaster river . Gingerly he got back to his feet , and the two men started down the Hogsback ridge . I climb back down , unable to continue in such clothing . " I do n't generally put on my crampons until I reach the Hogsback , " he says .