I love watching that everytime I see that. I noticed the tail wringing as well, but you know, I remember spectacular jumper who did the same thing after every jump. And this horse seemed to love to jump, you could read it in the expressionyou know?? Went to the olympics and everything. I have seen a number of horses that do that. You know we all have our interesting things we do , when I am concentrating very hard I often start tapping a foot or toe or my hand, perhaps it is something like that.
I posted the video on one of my english horse sites and the horse is named Matine and she is very popular. 1/4 Arab and I can't remember what the other 3/4 is. The tail wringing is not 'wringing' in a bad way, according to the dressage queens on the other site but a 'happy' wringing instead. Okay by me!! She is lovely!