USC’s running backs gaining a push from offensive line

LOS ANGELES — Before Stephen Carr dashed for 52 yards along the north sideline of the Coliseum in USC’s win over Stanford, he ran through a vast hole.
Carr, the Trojans’ freshman running back, was untouched past the line of scrimmage.
The hole, on the left side of USC’s offensive line, might have been close to 10 yards, based on TV replays.
Why was it so gaping?
Start with left guard Chris Brown, who pushed the defensive tackle, Mike Tyler, to the right, shoving him sever