While the historian Al-Baladhuri states that the altercation never became violent and ended with Ali's compliance, and Tabari makes no mention of Fatimah's involvement, some traditions add that Umar and his supporters forcibly entered the house, resulting in Fatimah's miscarriage of her unborn son Muhsin. Twelver Shia sources state that this occurred when Umar forced the front door open, crushing Fatimah behind it and breaking her ribs. However, the Mu'tazilite theologian Ibrahim al-Nazzam narrates that, "Umar hit Fatimah (sa) on the stomach such that the child in her womb died." Alternatively, Ibn Rustam Al-Tabari states that it was a client of Umar's named Qunfudh who caused the miscarriage, having struck her with the sheath of his sword. Other traditions add that Qunfudh had her whipped or had struck her face. The "Kitab Sulaym ibn Qays" (attributed to Sulaym ibn Qays, but possibly a much later creation) concludes the incident with Ali being dragged out of the house with a rope tied around his neck.