Do I follow the imam when he raises his hands as he goes down into prostration?

The questioner : The imam raised his hands when he went down into prostration along with the takbir.

The Shaykh : You follow him.

The questioner : You follow him, as he raised his hands in the first and third rak'ahs.

The Shaykh : This is what Abu Faris does.

The questioner : This is what...
The student : ...Abu Faris does.

The questioner : Yes, in the first and third.
The student : It is not done consistently, no.

The questioner : But why only the first and third?

The Shaykh : Generally speaking.

The questioner : He did not do it in the second; I did not follow him in the second.
The student : Because it is prescribed, Shaykh, it is not like that.

The questioner : Is it prescribed in the first and third?
The student : No, it is prescribed for the imam to raise his hands if he wishes.

The questioner: All right.
The student : What if I raised my hands in the first and second but not the third and fourth?

The questioner: Yes.
The student : If it were a four-rak'ah prayer, I would ask why the first and second? For example.

The questioner: Yes.
The student : But I raised my hands when I saw that I wanted to raise them, because it is prescribed for the imam to raise his hands when he wishes to go down into prostration, but without specifying that it is the second or third, or the first or fourth.

The questioner : So, is it permissible for him to raise his hands in one rak'ah?
The student : It is prescribed for him, yes, in one rak'ah and not the others, or in the whole prayer, for example, not to raise them, and to raise them.

The questioner: Yes.
The student : Sometimes, we are speaking in the presence of the Shaykh.

The Shaykh : There is blessing in you.
The student : May Allah bless you, O Shaykh.