Hearing? What does shots from above and casing hitting the floor sound like? Did they hear someone walking above? Did it sound like LHO footsteps? What about any other competing noises? Are you saying that hearing casings hitting the floor has to be the next floor what about the 7th floor? You don't know and neither did the so-called witnesses
Norman said NOTHING about hearing anything hit the floor above his head in the immediate aftermath ......The three amigos stayed at the windows looking out for several seconds ( Dillard said he took their picture about thirty seconds after the shots,
if you can believe THAT)...And then they were interested in the railroad yard....NOT in anything over their heads.