Kansas City Chiefs quarterback Patrick Mahomes had his helmet shattered on a hit from Miami Dolphins safety DeShon Elliott during Saturday night's frigid AFC wild-card playoff game. The Chiefs still won 26-7. With a game-time temperature of minus-4 degrees Fahrenheit, the game was the fourth-coldest in NFL history, and it was unclear whether the temperature made the shell of Mahomes' helmet more brittle than usual. Regardless, the reigning league MVP was left with a fist-sized chunk of plastic missing from just above his left eye after the clash of helmets on a 13-yard scramble deep in Dolphins territory. Rarely do...