Ruling on raising one of the limbs of prostration during prayer

His Eminence the Shaykh: If a person raises one of the limbs of prostration, does his prayer become invalid while he is in prostration?
It appears that if he raises it for the entire duration of the prostration—Meaning: meaning he remains in prostration while having one of the limbs raised—then his prostration is invalid, and if the prostration is invalid, the prayer is invalid. However, if he raises it for a brief moment, such as scratching his leg with the other and then returning it to its place, I hope there is no blame on him.