Better watch this, and listen carefully, because Oswald talks to Bookhout. I said: Oswald talks to Bookhout, and you can hear him.
Oswald said: "What have you got against.." something. Don't take my word for it. Listen to the tape. And think about it: what could Oswald have been referring to? I don't see how it could be related to the assassination. What it tells me is that at some point, Bookhout and Oswald must have been having a friendly conversation about something. And look at the expression on Oswald's face. It's very relaxed. He's doesn't look heavy. And everything relating to the assassination was heavy. So, this tells me that Bookhout got friendly and chummy with Oswald. Is there any chance that they knew each other from before? We know that Oswald had ties to the FBI, and Bookhout was an FBI agent. So, maybe they knew each other. And it explains something: it explains why it seemed that when Oswald glanced over at the shooter, that he knew him. He did because the shooter was Bookhout.