Grim Reapers (S01E04)

In Monterey Bay, California, a surfer faces a frightening assault by a Great White shark, but astonishingly, dolphins come to his rescue. Did they truly put themselves in danger to help him? Meanwhile, throughout the United States, various pets seem to possess an uncanny ability to sense when someone is nearing death. Can they truly detect the scent of mortality? Additionally, in Missouri, a slender teenager manages to lift a car to rescue a man pinned beneath it. How could such an extraordinary feat be possible?