If the imam prays with only one ma'mum and makes a mistake, and the ma'mum points it out, does he go back?

The questioner : My brother, if he is praying and has with him only one ma'mum, and he makes a mistake and is corrected, that is good.

The Shaykh : What are you doing, people?

The questioner : With peace.

The Shaykh : A man says: I have with me only one ma'mum, so he reminded him by saying "Subhan Allah." Does he go back to what he said, or does he follow his own opinion? We say: he does not go back to what he said, which is what we have been discussing. He does not go back to what he said. But sometimes, when he is reminded, he becomes convinced that he is correct. Who is correct?
The one who reminded him is correct. And if he is convinced, then it is obligatory for a person to act according to his conviction regarding additions or omissions. Consequently, he is required to go back for that reason. This often happens with two men who joined the prayer late. Sometimes one of them forgets and relies on whom? He relies on his companion who came with him. You find him saying: "I want to lengthen the prostration. I want to see if this one sits or stands." Yes, if he sees him sitting, he sits. If he sees him standing, he stands. Yes.