Sounds to me like Obie knows that your getting scared to ride him. My horse lizard will buck anyone off that he knows is nervose(spelling?). I've been thrown hundreds of times! Does he relieze that your the one in controll or does he think that he is the boss? My boy Ichabod thinkd that no matter what he is the boss of what happens and how it happens. All I had to do was show him that I'm the boss and not him. I hope this helped some. Sorry my spelling isn't the greatest. I've never jumped before so I can't help you with that.