I have finally started to get more confidence on my app gelding. After purchasing a sway back saddle pad and new saddle, I think I have his comfort worked now. Last weekend when I rode, I got him to a gallop and he ran back to gate where other horses are. I was about to unsaddle him, but instead of stopping him where I normally would have, the round pen, I let him run on. Once he got there, I couldn't get him to move. He would not walk away from the gate or the area. I would turn him and give leg pressure and he wouldnt move. Once I got him turned around facing way from gate, he starting backing up, almost into the fence. He didn't seem like he was going to act up, just couldnt get him to move. I got off and took him to round pen rode him around at walk and trot and kept moving his feet doing tight circle and stops. How can I stop this if he ever does it again? He doesn't seem buddy sour, as I ride him away from other horses where he can't see them.