EL SEGUNDO, Calif. — Butch Barry’s persistent encouragement has been the soundtrack of the Los Angeles Chargers’ spring practices. The team’s new offensive line coach prefers two simple words when urging on his players, according to tackle Joe Alt. “’Go,’” Alt said, “and ‘run.’” Two offensive linemen align across from a teammate who holds a large pad. Barry yells out to indicate the snap of the ball. The linemen surge diagonally, either left or right.