unless you have also trained in tracking?

And hunter gatherers even to this day are absolutely great at that, plus we could/can pass the knowledge down generations. We literally hunted down many of the megafauna to extinction.

I'm not sure about wild horses, but I have spent some time observing moose, which seem like a similar design. They don't seem to have much of a sense of purpose. So once scared into running, I don't think they would run very far before stopping to browse on some berries or nice grass.

People skilled in persistence hunting [0] track their prey even if it runs away from their sight. It still gets exhausted / overheated faster than the pursuing human hunters.

[0]: https://en.wikipedia.org/wiki/Persistence_hunting