Wagtail
Horse servant
My interpretation would be that there is some form of pecking order that comes into force at bringing in time in the winter - it's hell for me with a pony that's only one up from the bottom of 10-12 geldings! That's not about protecting resources. We get run at and threatened, bitten, if I try to get mine out of an evening ahead of other horses which I think all would say on the yard are the more dominant individual horses at the yard. Mine very sensibly respects his position in that herd I think and it does cause him distress at that time when it's busy at the gate - he starts to panic before they close in (and yes I do do my best firmly to get them all moved back though some will just not yield position).
I really hate it when this happens at a yard. Years ago I heard about a lady was kicked in the head and died trying to get her low ranked horse out through the others.
It is not something I would allow to happen at my yard. If a livery needs to get their lower ranking horse out, I always tell them to come and fetch me first. My herds are only made up of three horses and so it is quite easily controlled with two people. When I'm alone, I always get the horses out in order of dominance. That way it is peaceful and as safe as possible. I don't know what the solution is on DIY yards with large herds. It is so dangerous for people.