The ruling on one who enters the prayer with the imam after he has risen from bowing and did not catch the bowing

Question:
He says: I entered the prayer with the imam in the first rak'ah, and he rose from the bowing before I caught it. Is it obligatory for me to perform a rak'ah after the taslim, or is my prayer complete?

Answer:
If the imam raises his head before you bow for the ruku' and your hands reach your knees, then you have not caught the rak'ah. So you must perform what you missed after the salam, after the imam's salam. You perform this rak'ah after the imam's salam because you did not catch it. But if you said the takbir of ihram while standing, then you bowed and your hands reached your knees before the imam raised his head, then you have caught the ruku'. So you must be composed and say "Subhan Rabbi al-'Azeem" (Glory be to my Lord, the Exalted), then catch up with the imam. Yes.