Yoritomo's piety bought him a little more time to enjoy his success; he was 52 when he was thrown by a horse and died of his injuries.
The horse that killed Yoritomo had been spooked.
mnli hypothesis: The horse that killed Yoritomo had been spooked. premise: Yoritomo's piety bought him a little more time to enjoy his success; he was 52 when he was thrown by a horse and died of his injuries.