Imo, if there was a shot from the Grassy Knoll, it was purposely a blank with smoke effect to draw attention away from the expert shooter at the SW window 6th floor TSBD and a 2nd shooter Daltex bldg. This GK shooter may have sat on the hood of the car where muddy footprints were
found including on the rear bumper of the car. There may have been one other man, whom was with him. These 2 were probably the 2 men whom Lee Bowers saw, from the railyard tower behind the GK fence.
If it was a diversion shot, from GK, then it worked, since police and crowd ran to the GK. Only 2 DPD seem to have reacted differently, Baker and Barnett. Baker, who saw pigeons fly from the rooftop of TSBD and headed that way, rushing to the front entrance, and Barnett running to the side to observe the fire escape and also the back of TSBD. Barnett however failed to secure the WEST side of TSBD for up to 3 minutes.