Originally Posted by riccil0ve
It could definitely be tied to the cold and the horse not being warmed up properly.
I also have to agree with the others that I doubt he bucked for five minutes. Maybe he threw a buck every time he was asked to canter for five minutes, but not started bucking and five minutes later stopped.
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He literally bucked for 5 minutes. He typically has a lot of energy, but he really did carry on like that for 5 minutes. He was going round and round the pen bucking, and every time he quit, it was because he stopped dead in his tracks and she would shake the rope at him and he'd just start bucking again and still not canter. He's never done that, because he knows it's a no no!