As discussed many times before, by the form of mislogic the brothers contrarian apply to this case, no one saw Booth shoot Lincoln. They merely heard a loud sound that they "thought" might be a gun shot, and looked in that direction to see Booth pointing a gun at Lincoln. They then "assumed" he had shot him when Lincoln slumped to the ground with a bullet in his head. For all we know Booth merely picked the gun up off the ground after Lincoln committed suicide. He worked there after all! Just bad luck for him. It is complete nonsense. No one has to see a murderer pull the trigger to know that he did so. Many murders are, for understandable reasons from the perspective of the murderer, not committed in the presence of witnesses. And yet they are solved. To suggest that because no one saw Oswald pull the trigger that there is somehow doubt that he did so or that shots were fired from that window when a variety of witnesses place a shooter there and the physical evidence discovered on that floor verifies it is outlandish kookery. Even the most desperate defense attorney who knows he has a stone cold guilty client would blush at that bogus defense. And, of course, there is no attempt to explain the noises above Norman's head if he didn't hear shots. The best we are left to ponder by implication is that for some inexplicable reason some unknown person stuck a "pipe" like object out the window at the moment of the assassination and presumably beat a base drum before escaping unnoticed. And a variety of other unknown persons pulled off the assassination and planted all the evidence to frame Oswald. It is truly wacky, tin foil hat nonsense.