I am not saying you shouldn't use it, but like judging what a horse looks like just from video, I would be wary of putting much stock into two seconds of video after a race of a horse galloping out. If you're there live, maybe that's something different, but it's tough to be there live for every race these days.
Personally I'd be doing a lot more hypothetical wagering than real money with that info until I proved to myself that my opinion meant something.
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