A sound analysis of a proposed circumstantial clause checks four questions in order:
1. What is the main event? Identify the principal assertion.
2. Whose state is described? Locate the valid bearer of the ḥāl.
3. Where is the link? Identify the pronoun, wāw or both.
4. How does the timing and meaning fit? Confirm that the second clause genuinely attends the first event.
These tests transfer the theory of faṣl and waṣl to clausal circumstances without mistaking every wāw for ordinary conjunction.