[Appy]

Horse behind overruns the horse in front of him. Dangerous thing in that it can, and does, cause spills injurious to both horses and riders. It often results in injuries of varying severity to the horse in front by way of the toe grabs slicing heel bulbs, or even tendon/ligaments along lower rear of the trailing legs.
A horse can injure himself by overstep in his stride when a hind catches his own front.
Bandages can serve as a somewhat preventative measure to reduce tissue damage from such an incident, but they do nothing to prevent the trip/spills.