Part 3: Christopher works with a rider to establish a more secure landing position and lengthen the rein so as not to be pulled forward. He also explains that even small lapses in attention can change a line dramatically, as one second is two strides on the approach. By keeping impulsion, the riders realize they have more options when coming into a fence as the horse has the energy to take off long, or go in deep. He continues to work with the riders to retrain the horses they have unintentionally taught to rush the fences.