JB must be severely retarded to have given two shots to the neck when he should have known that one would have sufficed ?

He would have known of the jugular vein ! At close quarters ?
Yet psychological tests have proved that he had/has no such disability ?
Because that first shot had hit a blunt object ( a bone , hence the shattered bullet internally ) would there have been a recoil straight after because of this failure in hitting its target ?
Gas pressure after the first bullet would have allowed the bolt to remain open, enabling a second shot before re-loading. The idea being, of a semi-automatic, to allow the pressure to drop after firing before re-loading.