Let's say Mark Ingram or Clint Richardson just lowered his head and bulled his way through the initial LOS and you're coming up from the secondary to attempt to bring him down. He sees your approach and lowers his head again to meet your contact. Are you telling me that you have to avoid his helmet with your helmet, even though he's coached to use his helmet offensively. I think this rule stinks. Whether I'm a lineman, linebacker, or DB, if I'm a defensive player at all, you are putting me at a great disadvantage if I have to constantly mind not having my helmet meet yours on a tackle.