Not every following clause qualifies as istiʾnāf. First ask which question the earlier context naturally raises, then verify that the second clause actually answers it.
A report of illness may invite a question about cause; inventing a 'why?' after every statement is not a sound rhetorical analysis.
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Explanatory Resumption (Istiʾnāf) and Types of Implied Question
Not every following clause qualifies as istiʾnāf. First ask which question the earlier context naturally raises, then verify that the second clause actually answers it.
A report of illness may invite a question about cause; inventing a 'why?' after every statement is not a sound rhetorical analysis.