What does one do if he forgets the second prostration in the last rak'ah and remembers it?

The questioner : If he left it out. In the last rak'ah. He remembered it in the last rak'ah and said the taslim, then he remembered that he had not performed the second prostration. If he remembered it at the end of the closing.

The Shaykh : In the last rak'ah.

The questioner : After the second tashahhud.

The Shaykh : The second [prostration] in the last rak'ah, what does he do?

The questioner : According to the stronger position, he prostrates; he sits and prostrates.

The Shaykh : He sits down.

The questioner : And he recites the tashahhud and says the taslim.

The Shaykh : He sits between the two prostrations, then he prostrates the second time, then he recites the tashahhud, then he says the taslim, then

The questioner : What do you do in the prayer?

The Shaykh : Before the taslim or after? Before he added to the prayer?

The questioner : Do not do it.

The Shaykh : Yes, but he added to the prayer; he says the taslim before completing it, he says the taslim then prostrates after the taslim, okay, this is the stronger position.