To defend the pass, swipe your arm across the receiver's shoulder nearest to the ball when the pass is launched. Position your opposing arm on the other side of the recipient. Don't touch them, but prepare to wrap your arm around the receiver if they catch the throw. There are two ways to break up passes: defensive ends and linebackers. As you can see in this video, they both get involved in the play, but one will usually start the breakup process while the other finishes it. Both players must stay with their assignment until the ball is out of the receiver's hands; otherwise, a free runner will be available downfield. The goal of the defense is to either force the quarterback into an incompletion or fumble, or stop the runner before he gets away. If the defense stops the runner before he reaches the end zone, then it has accomplished its job. If he crosses the line first, the defender has caught him and there will be a new set of runners on the field. This is where experience comes in handy for offensive coaches, who can figure out different way for their player to get outside the box. Only the linebacker or defensive end who makes the first contact with the receiver prevents him from catching the ball. The remaining defenders should position themselves so that they don't get overrun by the block.