The shot at Walker was to help the setup of LHO . Actually when you think about it , the shot on Walker failed to hit him so that would have been possible for a shot by (Maggies Drawers) LHO as of course was the case in the shot that missed the whole limo and made a ricochet off James Tague cheek . LHO was not a firearms expert . If Carlos Hathcock said he couldn't make the shot then LHO would not have even been close , plus it's kind of hard to blow the back of JFK's head off and be shooting from behind . The evidence is overpowering in Oswald not even firing a weapon that day , much less hitting anything.