قَالَ الشَّاهِدُ: «لَمْ أَرَ الْحَادِثَةَ». كَانَ حَاضِرًا.
The witness said, 'I did not see the incident.' He was present there.
If the last sentence is the narrator's statement, it must not be absorbed into the witness's quoted words. Careless coordination could suggest that the witness also uttered 'He was present.' Faṣl, along with explicit quotation boundaries, protects attribution.
This is the concern underlying quasi-complete disjunction. A shared topic is not sufficient reason to coordinate clauses when doing so distorts who is responsible for a particular claim.