page 125 of 239 of The Devil’s Highway: A True Story

Interesting how he compares crossing the literal border with each successive border crossing of heat exhaustion: first it’s Heat Stress, then Heat Fatigue, then Heat Syncope, the Heat Cramps, then Heat Exhaustion, and finally Heat Stroke. I’ve gone as far as borderline between Heat Fatigue and Heat Syncope, which is an unusual feeling of disorientation. To go beyond that is just terrifying.