The ruling on the rak'ah of the ma'mum if he lags behind the imam in prostration

Question:
May Allah reward you, Honorable Shaykh. This questioner says: If a person prostrates and prolongs the prostration, and then the imam rises from the prostration, does he sit in the prostration? Yes. He says: If a person prostrates and prolongs the prostration, and then his imam rises from the prostration and sits between the two prostrations, and then the ma'mum rises after that, and his imam has already prostrated the second prostration, is this rak'ah invalid? Because we have heard that some imams do not consider it invalid unless one lags behind the imam by two pillars.

Answer:
If he intentionally lags behind, if he intentionally lags behind until the imam enters the second pillar, lagging behind the imam by a pillar until the imam enters the second pillar intentionally, shortens the prayer. The saying of the Messenger (peace and blessings be upon him): “The imam is only appointed to be followed,” meaning to be obeyed, so do not differ with him. But if he did not intend this, because he was sleeping, dozing, or did not hear the imam, did not hear the prostration, and then he rose and performed the sitting between the two prostrations, and then caught up with the imam for a complete prostration, there is no harm, because he made up what he missed and he is excused, because he lagged behind him unintentionally. Yes.