NFL one I believe is more head clashes, some players will even lead with the head.
think it was Sup42 that mentioned the high velocity coming to a sudden stop does a great deal of damage- regardless of helmets
Yeah the brain bounces off the skull. Thankfully the new tech helmets with the shock absorbent materials lining the insides are much better now.
This type of injury is called a contra coup injury....where the brain bounces inside the skull slamming into the side of the hard bone.
We have been witnessing it in rugby league for years, without really realising what we were looking at.
When you see a well performed spot tackle, at high speed, and the players head gets rocked, without being touched, due to the deceleration forces and the jolting impact...you will see these woozy guys stumbling about after they stand up....that is it right there......brain injury....no head contact.