Hi Hock
Dr. Estwanik covers head injury, but mostly from the vantage point of receiving a blow and not delivering the blow as in the case of the head butt. He does however concur on all the data that you have presented in relation to “head injury” (most references in the book are in relation to a boxing match or MMA competition with rules).
He describes the brain floating in a rock solid vault called the skull. He also uses the analogy of a yolk (brain) suspended in its’ shell (skull). One doesn’t have to crack the egg so to speak to cause irreparable damage to the brain. Shaking the egg violently can scramble the yolk without cracking the shell. On the other hand, a sharp tap to the edge of a frying pan can open the shell without breaking the yolk. He says, “ Punches, kicks, head butts or elbows delivered to the head produces a sudden acceleration which shakes and scrambles the yolk within its’ shell. This scrambling interferes with the transmission of nerve impulses, short circuiting the brain cells, leading to an altered state of consciousness.”
With all of our anatomy used as offensive weapons, the primary target for destruction is the opponent’s head- most systems agree with this! With that in mind, if we are using the head as a primary tool, it goes to say that we are gambling severe injury that could result in a continuum of death from Dementia Pugilistica (punch drunk) all the way up to Epidural Hematoma (high pressure blood clot to the brain).
Cheers
Joe