What is the ruling on the prayer of an imam who forgot a verse from Surat al-Fatihah in a prayer where the recitation is loud?

The Shaykh : And this is Ibrahim ibn Hamad ibn Qasim. An imam is praying a prayer where the recitation is loud, and he forgot a verse from Surat al-Fatihah and was not alerted to it until some time after the prayer. What is the ruling on his prayer and the ruling on the prayer of the ma'mum (those praying behind the imam)? And if he repeats the prayer, along with those with him, is his action valid? Yes, his action is valid. In fact, it is obligatory for them to repeat it, because omitting a letter from Surat al-Fatihah is like omitting it entirely. Yes, in this case, because they hear him. But if they did not hear him, it is said: if they had recited the correct Surat al-Fatihah, then they owe nothing. Is that clear? Good, this is Ahmad ibn Sahir.