Offering obligatory Prayer behind an Imam offering a Nafilah Prayer

A: If a person misses the `Isha' Prayer and there is another congregation offering the (Part No. 6; Page No. 306) Tarawih, this person has the choice of either offering the `Isha' prayer individually or with another group who has also missed the `Isha' Prayer, or to join the congregation of the Tarawih Prayer but with the intention of offering the `Isha'. In the latter case, the Ma'mum (the person being led by an Imam in Prayer) should stand up after the Imam says the Taslim (salutation of peace ending the Prayer) and continue their Salah. This is because the soundest opinion of the scholars' two opinions assumes the validity of Salah of a person offering Faridah (obligatory) Prayer behind an Imam (the one who leads congregational Prayer) offering a Nafilah (supererogatory) Prayer. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.