That`s a very good question. All of these years a lot of folks believe there was a shot from the "grassy knoll" that hit the president in the temple. Now, we hear that the frontal shot didn`t come from there so what are we left with? I`m not any kind of expert, but I do still think something hinky was going on there. Perhaps someone had a firecracker or a rifle/gun with a faulty silencer. I just don`t know at this point. I do know that according to acoustical evidence which may be totally debunked by now? Or maybe not, that there was a loud noise before Oswald or whoever was firing from the TSBD building fired their gun. According to Donald Thomas` Hear No Evil, there was a very loud sound, that did not meet the criteria for a bullet with it`s sound wave impulses right before the TSBD shot. He speculates that Oswald (or someone) heard this loud noise and it prompted them shoot as a reflex. This was too soon as the tree limbs were in the way, but Thomas speculates that the shooter upon hearing this loud noise fired his weapon. As a non-expert, I find this reasonable. I`m not saying that is what happened, but it makes sense IMO.