The ruling on one who catches the second rak'ah with the imam and the imam prostrates for forgetfulness

Question : A man says: I caught the second rak'ah with the imam in the Zuhr prayer, then the imam made a mistake and stood up for a fifth rak'ah. The people recited the tashahhud (tasbih), but he insisted on standing, so the people followed him and completed their prayer, and he prostrated for forgetfulness. The question is: Does the man who was behind stand up after the imam says the taslim and perform a fifth rak'ah, or what does he do?

Answer : He does not perform a fifth rak'ah because he prayed four rak'ahs. If he were to perform a fifth, it would be an addition to his prayer from his own action. Accordingly, he says the taslim with the imam.