A 14-year-old ranch kid from Big Timber, Montana, had a rope in his hand when cries for help erupted from the Yellowstone River. He sprinted into the water, threw one loop and caught a struggling man around the arm and neck, pulling him safely to shore. Jory Thomas, 14, was absent-mindedly flipping loops with a rope while visiting his grandparents' campground on the Yellowstone River over the Fourth of July weekend when he heard someone start screaming for help. Within seconds, the Montana ranch kid emptied his pockets, splashed across a side channel and waded chest-deep into the river. Then...