The Linebacker closest to the ball carrier runs directly at the runner, the deeper linebackers take a deeper angle to the runner.
Linebackers are masters of the read and react technique and use it extensively.
As a rule linebackers play the run first and the pass second, but obvious instances often call for the inverse. Linebackers are sure tacklers who work with the defensive linemen on a wide range of coordinated stunts and blitzes, and often figure prominently in short pass coverages. The default responsibility for the Linebacker is to read and react to the open offensive lineman to the LB's side of the field. Usually, this is a Guard but may be the Tackle in some alignments. If the OG blocks down, the LB slams down with his outside shoulder on the OT's inside shoulder and looks for the play inside.