Does catching up with a rak'ah depend on bowing alone, or on reciting al-Fatihah along with bowing?

Question:
He says: Honorable Shaykh, may Allah grant you success, how does one catch up with a rak'ah? Is it by bowing alone, or by reciting al-Fatihah and bowing?

Answer:
Catching up with the bowing is sufficient, because Abu Bakr came while the Messenger (peace and blessings be upon him) was bowing, so he bowed with him. But before he entered the row, a scorpion stung him and he entered the row. When the Messenger (peace and blessings be upon him) finished the prayer, he said to him , meaning: Do not enter the prayer before you reach the row. He did not order him to repeat the prayer, which indicates that the rak'ah was counted. Reciting al-Fatihah is dropped in this case, even according to those who make it obligatory, because its time has passed and he was unable to perform it.