I'll try getting some pictures, but I have no idea how to download videos with my iPad :/ but yeah....I will get some pics. If he's trying to avoid potential pressure, why doesn't he do it while cantering and walking? He also doesn't do it when I trot under saddle clockwise. Trotting clockwise in hand makes him do his weird head thing. Not anti clockwise.
It's just really weird. When I trot in a straight line, he doesn't dip his head. Yesterday he did it, it seems to stop happening when I DO put some pressure on the halter to keep his head steady. Its easy to control his head dipping but why does he do it???? The pressure theory sounds fair enough, but it just confuses me that he only does it while going one way. Ahhh...!