thanks anon. don't get to see too many images with the storm drain opening.
so they way the theory goes, going from memory here, so might have some of this wrong. but one theory says the fatal shot came from the storm drain opening at the curb. have heard that after shooting the shooter could flee through the drain system to the NW and quickly end up in an area to come out of the drain and up to ground level and a getaway car. supposedly to get there from dealey plaza on foot and on the ground would have taken much more time due to obstacles in the way on the surface. (train tracks and highway)