Greer applies brakes, JFk hit in cheek by pavement fragments from bullet miss, hit in back, limo windshield holed, chrome above rear view mirror dented
DPD cops close on JFK limo in forward lean from braking
DPD motorcyclists overtaking JFK limo, SS follow-up car braking to a halt, LBJ limo and follow-up car stop in Elm/Houston intersection to keep press cars with cameramen out of Dealey plaza while JFK is shot dead