The hotel security guard was shot in the leg and is not dead.
If there was another shooter, where is the broken window that he used?
This is a red herring and crap report.
The Timeline of the Las Vegas Mass Shooting, Start to SWAT
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http://gunwatch.blogspot.com/2017/10/the-timeline-of-las-vegas-mass-shooting.html
The guard was wounded. He and early police likely stopped the killing.
Told that lower level windows can be opened.