Sorry that you maybe got more than you bargained for here. But that's the great thing about public forums; you may get a perspective that never occurred to you before. Such as the possible risks of having a horse in a locked stall. Maybe you were worrying more about him being stolen, but his risk to barn fire might be higher. I have to admit, I've never heard of a locked stall.
And your first post made it sound like the horse's were never turned out.
If you want to explain their situation further, feel free.
Or, just let this one go and call it a learning experience.
I am sure you can be a teacher in some capacity. Everyone has something to share.