That’s an interesting point James. I am guessing that you are referring to the absence of anyone running away from that area with a rifle.
Since you appear to be interested, do you have the capability to simulate how much of Elm Street can be seen from the position that J.C. White was assigned to (the west side of the TUP, above the north curb of Main Street)? I am guessing that the limo would disappear from his view as it traveled down the slope towards the TUP. But I think that it would be interesting to see at approximately what point (Z-frame number) it disappears from his view due to the structure of the TUP itself.
The pergola and shelter show in the area between the sign and TSBD and give an alternative identification of a caboose, imo.
Here is a quick animation from J.C.
Foster’s Whites location on the TUP over the south curb of Main at the west banister. I used an eye-height of 72 inches. The timing begins about when Tina Towner begins her film at the turn and ends near Z313. Even without spectator’s blocking the view
Foster’s White's view of the motorcade wasn’t great.