Chapter: Urinating in Standing Water

The reader: "Chapter: Urinating in Standing Water".

The Shaykh : Why did you put a tanwin on it?
The reader: Because in my copy, it is disconnected from the following word.

The Shaykh : Disconnected?
The reader: Yes.

The Shaykh : Which one? Is "water" raised in your copy?
The reader: "Urinating" is raised.

The Shaykh : "Urinating"?

The Shaykh : We do not have a mention of "urinating" in the main text; it is not mentioned. In my copy, "urinating" is mentioned in the margin, but it is in the genitive case, and there is no reason for it to be disconnected, because what is the meaning of: "Chapter: Urinating in Standing Water"? Where is the predicate?
The chapter is not disconnected from what follows it unless there is a predicate. That is, if the sentence following the mention of the chapter can function as a predicate, then the chapter takes the tanwin.
The reader: "Chapter: The Prohibition of Urinating in Standing Water".

The Shaykh : Yes, "Chapter: The Prohibition" is correct. So we say: Chapter: Urinating in Standing Water.
The reader: "Chapter: Urinating in Standing Water".

The Shaykh : You have understood the rule: when is the chapter given the tanwin?
When what follows it is a sentence. But if what follows it is a single word, then the chapter is connected to it.
The student: Is the tanwin optional, or is it obligatory?

The Shaykh : It is not obligatory, because if it is connected, the predicate of the subject remains attached.
The student: In my copy, it is in the genitive case.

The Shaykh : Yes, and that is the correct form; it is in the genitive case.