Simple physics explains that...
As Kennedy's brain/skull are hit, matter is propelled out of the exit wound (ballistics models and such explain that). Some of that is going to be more vertical. Considering the pieces are small, wind resistance will keep them from staying directly in line with the president's limo. These pieces that are slowed down will be run into by vehicles/people/etc. behind the presidential limo.
Super easy explanation, dude.








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