These are two very low on the pole non aggressive horses. They were "playing". I am learning EVERY DAY horse language and knowing that just like my new puppy AMORE that she turns into an alpha in a second. Same seems to go with the horses. They can be so submissive, but, they then are venturing, routing, aspiring, what is the word ?? for the top dog, the top horse, the TOP STUD. It is a huge rivalry, and would you believe that the mare they are fighting for is
So, Yes, they are no longer where they can play and fight with each other. I hate it, because I know they love the interaction. But, the vet bills when the play becomes "more" is too much "more."