When is the bowing counted with the imam?

Question:
If a ma'mum joins the imam before the imam bows, but does not bow until the imam has risen from the bowing because he was occupied with reciting al-Fatihah, is the rak'ah counted, or must he make it up and it is not counted?

Answer:
It appears that the rak'ah is not counted; he missed the bowing, as the imam bowed and rose while he was intentionally delaying.
Q: If the imam rises from the bowing and forgets or delays in saying the taslim, and a ma'mum delays and sees that the imam has risen while the congregation is still bowing, and then he bows with them, is the rak'ah counted?
The Shaykh: If the imam has risen, the rak'ah is not counted.
Q: But he did not say the taslim; he delayed in saying it, meaning he rose without saying "Allahu akbar" (or the response), and delayed slightly?
The Shaykh: The point is that if he rose from the bowing before the ma'mum bowed, it is not counted.
Q: Even if the congregation is in the bowing?
The Shaykh: Even if so, the criterion is the bowing of the imam.
Q: One who bowed with the imam but was unable to say "Subhan Rabbi al-Azim" even once.
The Shaykh: If he straightened his back in the bowing and then recited the tasbih, it sufficed for him, because his bowing was completed.