What does byrd say about mckinley's character in paragraphs 30 and 43?

33, now the stream of air pouring down the pass roughened perceptibly. the great wing shivered and teetered as it balanced itself against the changing pressures. the wind from the left flowed against fisher's steep flanks, and the constant, hammering bumps made footing uncertain in the plane. but mckinley steadily trained his 50-pound camera on the mountains to the left. the uncertainties of load and ceiling were not his concern. his only concern was photographs--photographs over which students and geographers pore in the calm quiet of their studies.

42, mckinley shoved a second bag through the trapdoor, and this time we saw it hit the glacier, and scatter in a soundless explosion. two hundred and fifty pounds of food--enough to feed four men for a month--lay strewn on the barren ice.