I like the POV it does instill fear, I'm speaking as someone who has been lying on the ground when a horse has cantered over me. However the focus could be a little clearer on the right hand side horses body.
Good angle. Were you trampled after the shot was taken? Looks like motion blur of horse on right, which is effective here. Horse on left is too shadowed and mane blocks the face, which is unfortunate.
FINALLY a clear, proper entry and a great photo as well. You didn't put the definition but in this case it is very easy to deduce. Great job. Great choice of horses also - white or brown would not have been as effective.
Horses, yes? Black ones too. Somehow you're not managing to convey any phobia. I think this composition would also benefit from a sharper focus. Otherwsie technically sound.
The ground-level view helps make them look intimidating--nice job! The composition works well, though I'd like to see more of the legs and less of the sky.