[Ive heard that hard head banging and such like what heavy metal enthousiastes might do at concerts can cause issues because after a little while it disrupts the flow of protective fluids in our skull but again I’m no expert it’s just what I remember mark]

Ben, you did not hear that from me or you redefined what I said.

I would have said, Head banging disrupts the way the brain controls the fluid pressures in the head. This can lead to too much fluid pressure of both blood and CSF (cerebrospinal fluid). Too much fluid and too much pressure can be dangerous.

It has nothing to do with protecting the brain from impacts as it is sloshing or banging around in the skull.

Ben, You always take comments and try to find a way to find a source of brain damage in those comments. STOP trying to redefine what others have said. It is disrespectful.