I am not sure about that. I am NOT saying you are wrong, I am NOT saying I disagree with you. I am saying I am not sure. Reason being is horses will do incredible things through fear, I've seen some pretty unreal feats from fearful horses, most often they hurt themselves or somebody else. Looking at a couple of videos a few times, it looks to me the horse gets separated from the others and tries to follow them no matter what is in the way. He looks like he's desperate to get back to the safety of the herd. Horses have great hearing. He certainly would have heard the crowd on the other side of that fence although he wouldn't have been able to see them - race fans do make a racket during a race! It looks as though the horse ran and jumped blindly to get back with the others. As you watch the vid you can see that the horse is going in the same direction as the runners, and they run more or less in front of him and it looks like he's trying to follow. Again I am not saying you're wrong, I am saying this is what it looks like to me from the video and info provided. I am saying I, personally, am not sure.