Moving around after TSHTF

[NorthernRaider]

Yup a rifleman is taught to move his head side to side as he patrols because the rods and cones in your eyeballs are set up so that the sides of your eyeball detect MOVEMENT much better than the back of the eyeball which detects SHAPE better, Especially in low light or darkness the sides of your vision is more likely to detect a threat than if you looked straight at the target area.