Descr1: 1. A person walks by a person on a horse
  2. Another person riding a horse hits the person on a horse and stops but the horse still appears to be running
  3. The person is launched into the air and the horse falls down
  4. The person gets back onto the horseback and rides away
Descr2: 1. A man riding on a horse collides with a stationary horse
  2. The man's horse runs in place
  3. The man's horse collides with the stationary horse
  4. The man is thrown off of his horse