The only fix I can see that should be applied to snipers are the plan of field view in the scope used. When a subject moves closer to the scope it should blur as the plan of field is fixed at a magnification limit on the scope. A 3 set 4-10x magnification 40mm eye piece does not just "autofocus" or focus below its intended set magnification to account for a moving subject. When it's out of range the scope is useless. This is how a tactical eye piece works. It's intended use is mid to longe range and the effectiveness should be negated all together at close quarter combat.