The ruling on one who raises his head from prostration thinking that the imam has said the takbir, then returns to his prostration.

Al-Hawini: Our brothers in the neighboring camp were praying 'Asr with us. They were in prostration when they heard your takbir over there, so they raised their heads. Then they saw the imam was in prostration, so they prostrated again. What is the ruling on their prayer? I mean, they thought the takbir was from their imam, so they raised their heads, but they found the imam was in prostration, while the takbir was from here.

The Shaykh : I mean, they thought they had an imam there, other than the imam who is here.
Al-Hawini: No, I mean they were in prostration when they heard the takbir here, so they thought their imam had said the takbir to raise their heads from prostration. So they raised their heads, and then they saw the imam was in prostration.

The Shaykh : Their specific imam?
Al-Hawini: Their specific imam.

The Shaykh : I mean, they heard our takbir here and thought it was the imam's takbir.
Al-Hawini: Yes, yes.

The Shaykh : Okay, so when they heard the takbir from here, they thought it was their imam's takbir, so they raised their heads.
Al-Huwayni: Yes.

The Shaykh : Then they made up for it.
Al-Hawini: So they prostrated again.

The Shaykh : So they joined the imam in prostration.
Al-Huwayni: Yes.

The Shaykh : Then they owe nothing.
Al-Hawini: They owe nothing?

The Shaykh : They owe nothing.