The imam concluded the 'Asr prayer with three rak'ahs, but the ma'mum did not conclude and waited until the imam stood for the fourth!
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Question:
He says: Honorable Shaykh, may Allah grant you success. In the 'Asr prayer, the imam prayed three rak'ahs and then concluded. I knew that the prayer was incomplete, so I did not conclude until he was alerted by one of the ma'mum. He stood up and completed the fourth rak'ah, and I stood up with them and completed the rak'ah. Is my action correct?
Answer:
Yes, this is exactly the right thing. You do not conclude with him when you know it is incomplete. That is, if he stands up, you stand up with him and complete the prayer. Yes.
He says: Honorable Shaykh, may Allah grant you success. In the 'Asr prayer, the imam prayed three rak'ahs and then concluded. I knew that the prayer was incomplete, so I did not conclude until he was alerted by one of the ma'mum. He stood up and completed the fourth rak'ah, and I stood up with them and completed the rak'ah. Is my action correct?
Answer:
Yes, this is exactly the right thing. You do not conclude with him when you know it is incomplete. That is, if he stands up, you stand up with him and complete the prayer. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [1502 -2802] سلم الإمام في العصر من ثلاث ركعات ولم يسلم المأموم وانتظر حتى قام الإمام للرابعة!! — youtube.com
The Arabic text is a machine transcription of the audio recording.