Shortly past the midway point of the first quarter, draped in the spectacle of “Monday Night Football” and the high stakes of a pivotal game between the Cincinnati Bengals and Buffalo Bills, Bengals quarterback Joe Burrow floated a short pass to wide receiver Tee Higgins. Higgins sprinted upfield as Damar Hamlin bolted from his safety position to make a tackle. Higgins’s helmet met Hamlin’s chest like a battering ram. It was a routine play, until it wasn’t. It was a game that mattered, and then it didn’t.