This is a great subject, if it can stay peaceful
Everyone has to evaluate their own barn situations and pray they can get done what needs to be done in the few minutes they may have.
For my horses it would be a barn fire. Mr. WTW will be opening the paddock gate into the pasture, while I hopefully with a wet towel wrapped around my hand (there's heat even if the flames aren't close), will be unlatching stalls and pushing everyone out of the barn.
I don't halter my horses and, in my situation, I would not be wasting that precious time. That's what buggy whips are for --- get OUT that door NOW!
I am the Alpha when I'm in the barn and I would be hoping my Alpha horse wouldn't try to trump me during a barn evacuation.
Anyone that boards and everyone that needs to worry about forest fires, needs to make sure their horse can load quickly.
When I lived in SoCal, fast moving fires were always a threat. I saw fires started just from a spark from lawnmower blades.
Fires can change direction literally in the blink of an eye and be right on top of you.
I did loading drills, periodically, with my horses. When I said "hurry hurry, get up in there", they better hurry. My truck was never un-hooked from the trailer and it was always aimed at the back gate that I kept locked. I could easily have crashed the gate if I needed to.
There was one occasion of a forest/land fire down near San Diego, where the horses that refused to load got cut loose to fend for themselves; there was no time to play games with the fire bearing down on the boarding barn.
I don't know the outcome for all those loose horses but, some were recovered with little harm to them, others suffered a lot of injury.
Living out there, I never fretted over earthquakes (went thru two good shakers in five years) but the thought of fires and not having an escape route to get my animals to safety was very unsettling.