If we say, "I dressed his companion in the garment," the pronoun refers back to a word that is later in both expression and rank. What does that mean?

The student: If we say: I dressed his companion in the garment.

The Shaykh : I dressed.
The student: His companion in the garment.

The Shaykh : The garment, his companion.
The student: If we say: I dressed his companion in the garment.

The Shaykh : Yes.
The student: The pronoun refers back to a word that is later in both expression and rank.

The Shaykh : Yes.
The student: Why is it later in rank?

The Shaykh : Because the original rule is that the agent in meaning is the one who is placed first, and the companion is the one being dressed. So if we say, "I dressed his companion in the garment," the pronoun now refers back to a word that is earlier in expression, but it is later in rank, because the word "companion" is now the one being dressed, and it was his right to be placed first. But if we had placed it first and said, "I dressed his companion in the garment," the pronoun would now refer back to what?
The student: Earlier.

The Shaykh : Later in expression, even though it is earlier in rank.
The student: It is not permissible for the pronoun to refer back to a word that is later in both expression and rank. What is the reason from the perspective of meaning?

The Shaykh : Because the pronoun must have a referent.