Does the one who joins the prayer late follow the imam in the prostration for forgetfulness that is performed after the closing salam?

Question : May Allah reward you. The questioner says: If the prostration for forgetfulness in the prayer is after the salam, what does the one who joins late do, especially if he has already stood up to complete his prayer?

Answer : If the prostration for forgetfulness is after the salam, and the one who joins late stands up to make up what he missed, let him proceed. He does not follow the imam if the prostration is after the salam. Pay attention: if the imam’s prostration for forgetfulness is after the salam, the one who joins late does not follow him; rather, he stands up as soon as he finishes his own prayer. Why does he not follow him in the prostration for forgetfulness? Because following is not possible at that time, since following requires that he say the salam with the imam, and he will not say the salam because his prayer has not yet ended. Based on this, we say to the one who joins late: If your imam prostrates after the salam, do not wait for him. Stand up as soon as you finish your prayer and complete what is required of you. Then, if you were present for the imam’s forgetfulness for which he prostrated, prostrate two prostrations when you have completed your prayer and said the salam. If you were not present for it, nothing is required of you. An example of this is if the imam forgot in the first rak'ah and sat down thinking it was the second. This sitting, if he thought it was the second, is extra. But for what did he sit? For the first tashahhud. Then he remembered, or they reminded him, and he said...
Is this the place for the imam’s prostration after the salam or before it? After the salam, because he added to the prayer. Now, this ma'mum (one praying behind the imam) joined the imam in the third rak'ah, meaning he left two rak'ahs with the imam. Then he stood up to make up what he missed. Does he prostrate for the forgetfulness of his imam or not? Why?
Because he did not witness it. The imam was in the state of forgetfulness before this man joined him. All right, another example: a man is the imam, meaning he sat down in the third rak'ah of a four-rak'ah prayer.
Thinking it was the last one, and this tashahhud is, in the imam’s opinion, the final tashahhud. So he remembered, or he was reminded, then he stood up and completed the prayer and prostrated for forgetfulness. When is the prostration for forgetfulness? After the salam, because it is an addition, because it is due to an addition. The ma'mum joined him in the third rak'ah. Does the ma'mum prostrate when he makes up his prayer? Yes. Why? Because he witnessed the imam’s forgetfulness in his prayer. Yes.