S1, E4: Horse breeder Lisa Stillman is so impressed with Amy's work, she sends her nephew, Ben, to live at Heartland. Amy and Mallory can't believe the way he treats his horse, Red. After Red runs away from Heartland, the girls go searching for him. They find the horse near the edge of a river, but when Amy tries to lead Red across, his fear of water sends him into a panic, knocking Amy unconscious.