If you have ever run a marathon, or supported a friend or family member on the day of the race, you know what it is like at the finish line. All eyes are on that finish line – and the clock. The runners have reached the end of their physical limits and the people who are trying to see them finish are crushed together in a constantly shifting mass of onlookers, standing on tip-toes trying to see over the heads of the crowds to get a photo of their friend or family member at the very moment the runner passes through the gate. Nobody, absolutely nobody, is looking for danger.