This is a video of one of the bulls running around in the arena. You can see the bull totally pick up a guy, toss him and then pin him down. When the bull has runners pinned down or if the runner is in trouble, other runners run over and try and grab the bulls attention to get it to move away from the pinned runner. In the video myself as well as a few others do this to get the bull away from the pinned runner.
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