Sima Yi saw four characters carved on a stone, and shouted that Sima Jia was in danger, why did he turn around and kill the fierce general? Sima Yi saw four characters carved on a stone, and shouted that Sima Jia was in danger, why did he turn around and kill the fierce general? Sima Yi saw four characters carved on a stone, and shouted that Sima Jia was in danger, why did he turn around and kill the fierce general?