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.
Open all the time?? I've never left mine open. That's what those little cards are for.
Paddock blocked the stairwell door with a metal bar.