How does the author develop the connections between events in the excerpt? "This was along a steep, narrow gap between one side of the rock and the inner side of an adjoining cornice, and Hillary, now going first, worked his way up it, slowly and carefully, to a sort of platform above. While climbing, he had to press backwards with his feet against the cornice, and I belayed him from below as strongly as I could, for there was great danger of the ice giving way."