When a boxer is hit in the head by a moving fist, what type pf concussion injury does this,?

There is a transient electro-physiologic dysfunction of the reticular activating system in the upper midbrain caused by rotation of the cerebral hemispheres on the fixed brainstem. - The CSF cushions the brain from light trauma in times of more severe impact, the forces on the brain may be linear, angular, or rotational, in rotational movement, the head turns around its center of gravity: this is the primary mechanism causing concussion.