Answer
(Fatwa: 259/61TL/1430)
Muqim Muqtadi (an on-station person praying salah behind a musafir imam) is just like lahiq i.e. he will complete his salah without qirat. But, it is better for him to keep silent equal to time of reciting Surah Fatihah; since reciting it is better in third and fourth rakaah of obligatory salah, however it is also allowable to keep silent for a time equal to three tasbeeh and then go to ruku.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband