We know of a silenced Berreta and a Silenced MP5. I do not have too much knowledge of guns. But, I think they are side discharge weapons.
If so, there should be four brass cases on the floor. From what we heard, it does not seem that shooter took the time to pick them up. But, there was some pause between shots, so maybe the shooter did.
If there are not any cases we are looking for a revolver, right? Alternatively, the brass was not seen admists the turmoil and the Shooter doubled back to pick them up at a later time.
It is interesting to note that the person left alone in the guard room after the shooting is Riley.
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