“There's about a 30th of a second that the heart is even vulnerable to this. So not only does the hit have to be in the right spot on the heart and the right amount of force, it also has to be perfectly timed.”

Buffalo Bills safety Damar Hamlin, 24, is in critical condition after experiencing cardiac arrest during a televised game following a tackle, spurring worldwide shock, insensitive conspiracies, and serious discussions about the safety of America’s favorite sport.