DEAR Comrade Storing,
At LEAST you admit that those SEVEN people were CONSCIOULY reacting to the SAME loud sound that came from the direction of the TSBD. BY THE WAY, are you EVER going to answer my QUESTION: How does YOUR KGB-encouraged tinfoil-hat JFKA CONSPIRACY theory tie-in with your SUPPORT for The Traitorous Orange Bird (rhymes with "Xxxx")?
People in a parade are constantly reacting to all kinds of "stimulus" around them. And they even react to silent "stimulus" such as a "hand wave", or a hanky being waved around. (The old lady near Willis). And this is also true of the SS who were "on edge" and/or "hung over".