He sounds like a dominant horse that scared his former owner. I have a filly like that and finally sent her to a lady to teach her respect on the ground. I was recovering from surgery and knew it was going to be awhile before I was physically strong enough to work with her. She came back a new horse and both she and I have a new confidence level. I no longer dread working with her so I am clearer minded when I am with her and can head off the disrespectful moments. No more running me over or getting in my space.

Be careful