A state forest surrounds Isabel and Martin's home. They search the forest in a frenzy for their infant son Sebastian, who is half-human, half-horse. He has recently escaped from his playpen. They call Sebastian's name frantically. Inside their house, Isabel and Martin's three-year-old son Kaden realizes he is alone at home and feels left behind. Isabel and Martin continue to search frantically. Isabel remembers how the doctors told them Sebastian would never walk and that he would need orthopedic surgery. But Isabel had refused the surgery, and today, Sebastian had walked for the first time. Isabel was ecstatic. Kaden leaves the house in search of his family. Outside, Isabel and Martin search even more frantically. When Isabel visited Sebastian in his incubator just after his birth, she had looked down at him and fallen in love. She had been afraid that she might not love him, given his half-horse appearance. But she did, very deeply. When Sebastian walked for the first time, Martin wasn't as thrilled — he has painful and ambivalent feelings towards his son, because he wishes desperately that Sebastian were fully human. Kaden wanders to the dirt road near the house and sits down in the middle of it to change his shoes, which he'd put on the wrong feet. A truck suddenly rumbles down the road, and, seeing Kaden at the last second, jerks off the side. The driver is ejected and his body rests halfway through the windshield. Isabel finds Kaden there. The child is mesmerized by the wreck. Martin finds Sebastian in a meadow and gently leads him back towards the house. In the future, Sebastian will not remember when they encounter the car wreck, but he will never forget that his father brought him home.