In case anybody needs a refresher on why loose horses are so dangerous, Google Jeff Lucas and Tabasco Cat. And that wreck was in the shedrow, not out on the track
Or much more recently, at a Virginia Point to Point, a loose horse ran over/crashed into a photographer, seriously injuring him. Two broken arms, broken ribs, broken jaw and a lot of dental stuff. And those horses are moving slower, as a general rule, than flat race horses. The photographer wasn’t doing anything dangerous or unusual, he was standing by the wing of the fence, horse ran out at the fence, unseating the jockey, and ran over the photographer.
A loose horse after the race with that crowd of people and animals on the track on Derby Day? Unimaginable. Whatever that outrider needed to do to control the situation is okay by me.