The absence of wāw can have quite different grounds:
1. Complete disjunction: one clause reports, the other prays or commands; their functions differ.
2. Complete connection: the second explains or reinforces the first rather than adding a coordinate fact.
3. Near-complete connection: the second answers an implied question arising from the first.
The first emphasizes the lack of an appropriate joint predication; the second emphasizes closeness of meaning; the third emphasizes the logic of an imagined exchange.
Identifying faṣl alone is incomplete analysis. State why separation is appropriate and what inserting a conjunction might change.