..because the Mohammeds realized they had not time left to escape?
This is one hell of a change of the narrative. The initial narrative was that the guard was shot after he approached the door after Paddock started shooting. But then in viewing the tapes of the floors, investigators may have realized there was a huge discrepancy in what the guard said, and they saw that he was shot BEFORE Paddock started shooting at the general public. If this is true, it is a huge discrepancy, HUGE.