Mr. GREER. He appeared to me to be falling on his left shoulder when I glanced. He had only started to move that way whenever he--when I saw him. Mr. SPECTER. Were you able to see anything of President Kennedy as you glanced to the rear? Mr. GREER. No, sir; I didn't see anything of the President. I didn't look, I wasn't far enough around to see the President. Mr. SPECTER. When you started that glance, are you able to recollect whether you started to glance before, exactly simultaneously with or after that second shot? Mr. GREER. It was almost simultaneously that he had--something had hit, you know, when I had seen him. It seemed like in the same second almost that something had hit, you know, whenever I turned around. I saw him start to fall. Mr. SPECTER. Did you step on the accelerator before, simultaneously or after Mr. Kellerman instructed you to accelerate? Mr. GREER. It was about simultaneously. Mr. SPECTER. So that it was your reaction to accelerate prior to the time---- Mr. GREER. Yes, sir. Mr. SPECTER. You had gotten that instruction? Mr. GREER. Yes, sir; it was my reaction that caused me to accelerate. Mr. SPECTER. Do you recollect whether you accelerated before or at the same time or after the third shot? Mr. GREER. I couldn't really say. Just as soon as I turned my head back from the second shot, right away I accelerated right then. It was a matter of my reflexes to the accelerator. Mr. SPECTER. Was it at about that time that you heard the third shot? Mr. GREER. Yes, sir; just as soon as I turned my head. Mr. SPECTER. What is your best estimate of the speed of the car at the time of the first, second, or third shots? Mr. GREER. I would estimate my speed was between 12 and 15 miles per hour. Mr. SPECTER. At the time all of the shots occurred? Mr. GREER. At the time the shots occurred. Mr. SPECTER. Now what, if anything, was Mr. Kellerman doing at the time of the first shot? Mr. GREER. I couldn't really speak for where he was watching, what part of the street or the buildings or what he was watching at that time. I don't really know. Mr. SPECTER. Do you know what Mr. Kellerman was doing at the time of the second shot? Mr. GREER. He was sitting there in the front. No, sir; I don't know what his action was then. I was watching the overpass, I wasn't looking his way. Mr. SPECTER. When you were watching the overpass at that time, did you observe anything on the overpass? Mr. GREER. Not that I can remember now. Mr. SPECTER. Did you observe that there was no one present on the overpass? Mr. GREER. My recollection, there may have been a police officer up there. It is vague to me now everything that I had seen at that time. Mr. SPECTER. Do you know what Mr. Kellerman was doing at the time of the third shot? Mr. GREER. No, sir; I couldn't say what he was doing. Mr. SPECTER. Was there any radio communication between your automobile and any of the other automobiles? Mr. GREER. Yes, sir.