There was a “door ajar” alarm...It was down the hall from the killers nest.
More news when we make it up.
We just don’t know what “down the hall” means. It can’t have been a guest’s door because those are left open all the time if they’re expecting visitors or they’ve just run down for ice or whatever. The only other door would be the stairwell door. That door isn’t “down the hall” but right there at the shooter’s two rooms.