Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

Why is the TSBD doorway empty here? Where are the people? It's from a film that is just called "Newly discovered footage of JFK's last moments". And it's good clear color footage. The empty doorway occurs right at the 30 second mark and lasts for several seconds. Prior to it, it seems to be pre-assassination because the people on the street look normal. Here's the link. Note that at the end it immediately jumps to another film. 

https://www.youtube.com/watch?v=RMtdotTD8lY&list=PL7EA4D1B519BD387E