I'm going only by my memory here, but I don't think so. I think he was facing forward; reached back with his left hand, caught the breastplate, let the horse pull him into a spin, and then kicked and pulled his hips into the saddle. Tricky, yes. Impossible, no.
Of course a klutz like me would have dislocated that left shoulder.
But thinking of someone like, say, Mary Lou Retton in her prime-- no problem.
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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