Ferris Bueller can take a day off. But Pat Surtain II cannot be absent. One week after the coach and the quarterback squawked, talked and laughed about a sideline inferno that drew a comparison to a 1980s movie character, the Broncos learned how vulnerable they are without their best player. On the Chargers’ first series, Surtain whipped his body on a tackle and slammed his head to the ground.