High school senior Kieran Johnson loves to lead his school's football team onto the field. But at a recent game, the Texas teen led his team into the end zone. Kieran has Williams syndrome, a genetic condition that can cause developmental delays and heart problems. That hasn't dimmed his love for the game. As he was suiting up, he said, "I turn on my beast mode and whatever happens, happens." And when, in the second quarter, his teammates gave him the ball, he ran with it.