You and three friends have been hiking 18-20 miles a day for three days in the desert Southwest. It’s been hard and hot as anticipated, but not scorching hot. You’ve found water every day. This afternoon you backpacked over a steep sun-drenched sandstone ridge and down into a cottonwood glade. One of your companions has been lagging behind and eventually stops and sits by the side of the trail. He looks pasty white and sweaty and says he feels awful. Your scene size-up is brief: no hazards, one patient who looks sick and sat down. You think about BSI but keep your limited glove supply in your first aid kit for now. The patient agrees to your assessment, has a sound airway, is breathing without distress, is dressed in only shorts and t-shirt, is obviously not bleeding, has a strong radial pulse, and is on dry ground in the shade on a nice warm day.