The ruling on the ma'mum prostrating in following the imam when he leaves off the tasbih

Question : An example of this is the imam leaving off

Answer : saying Subhan Rabbi al-A'la in the prostration. And you, the ma'mum, do not know, because the imam does not recite the tasbih aloud. So when he intended to say the taslim, he prostrated two prostrations, for what? For what he left of the obligatory, of the obligation of tasbih. You, the ma'mum, did not leave anything in your prayer; all the obligations and pillars were completed. You do not have to prostrate, but now it is obligatory for you to prostrate in following the imam.