This guy discovers he can predict who will die (when more than one will) because the victims are breathing in synch with each other. Something along the lines of his noticing that two people are breathing synchronously, and then the are both killed in some sort of accident. He remembers the coincidence and he notices it more and more. At the end Something Bad is about to happen (He’s on a plane? A plane is about to hit his building?) and he notices that he and everyone else are breathing in synch.