‘And replays of Tagovailoa’s fateful scramble confirm as much: The Dolphins signal-caller initiates contact by lowering his head on a fourth-down run up the middle, opting not to slide and thus colliding with Hamlin’s chest before rolling off the defender’s legs and onto the grass. Hamlin initially thought Tagovailoa stayed down due to cramping, per The Athletic, but trainers quickly rushed onto the field once the quarterback displayed the fencing position, which is associated with a severe brain injury.’