Speaking During Salah (Prayer), or Turning Away Before Completion

2. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from ‘Umar from Fudayl ibn Yasar who has said the following: “Abu Ja’far عليه السلام, about a man who performs two Rak‘at obligatory, then forgets and stands up before sitting between them, has said, ‘He sits down until he has not assumed Ruku‘ (bowing down on one’s knees). His Salah (prayer) is complete. If he does not remember until he assumes Ruku‘, he then continues and after Salam (the phrase of offering greeting of peace) performs two Sajdah (prostration) because of mistake in a sitting position?”