[Az Joe]

He moves slightly forward as the shot enters the back of his head. Then the explosive force and energy of the bullet being stopped is transferred to the surrounding tissue causing what was essentially a mini-explosion in his head.

[JoeA]

...in absolute defiance of the laws of physics, which were suspended that day in Dealy Plaza: bullets turning in mid air; bullets that go through two bodies without being damaged; bullets weighing the same after being fired while still losing some of their weight; and the list goes on.