 Baird says if you notice a fellow hiker or someone on the trail is confused or disoriented, that's a red flag. They're in trouble. Even at the Grand Canyon, call 911. Stop hiking and get that person into shade. Ideally, in an area where the person is off of the ground, because even the ground can be superheated as well, and just try to actively cool with whatever resources you do have. On average, two people die of heat at the canyon annually. Connie Weber, Arizona News Radio.