Most gun fights end when someone shoots back, these guys are cowards and can't run fast enough when someone shoots back. I've seen a lot of people survive 9mm, 38, 40 and even 357 head wounds but never saw anyone survive a 22 into the skull for a couple of reasons. First it tends to punch in then bounce around. Second what normally kills on a head shot is a build up of pressure in the brain. Those larger calibers make nice drainage holes. A 22 hole quickly clots and the pressure builds.