Proper technique for a blitzing linebacker???

They need to hit the hole at full speed, but they need to be looking through the hole at the backfield. If the near back is going away, they need to come off the hip of the OL and look to the inside IMMEDIATELY. If the backfield crosses your face and goes outside, again, look at what is trailing before you pursue--contain needs to make that play. Your blitzers need to realize that they are still only a piece of the defense--just because they are blitzing, does not mean they are absolutely needing to make the play.