Earlier on, when Huan Fan escaped from Luoyang to join Cao Shuang, he encountered Si Fan (), who was guarding the Changping Gate. As Si Fan used to serve under Huan Fan, he trusted Huan Fan and allowed him to pass through. Once he was out of Luoyang, Huan Fan turned back and told Si Fan: "The Imperial Tutor (Sima Yi) is planning to commit treason. You should come with me!" However, Si Fan stayed behind and hid himself. After the coup d'état, Si Fan surrendered himself to Sima Yi and told him what happened earlier. Sima Yi asked: "What's the punishment for falsely accusing someone of treason?" The reply was: "According to the law, the one who makes the false accusation shall be punished for treason." Huan Fan was then executed along with the rest of his family.