Bal introduces a turn of thought. Mā tadhakkur min Nawār carries a rhetorical, reproachful or wondering force rather than seeking factual information. Wa-qad naʾat uses qad with the perfect to stress that her departure is an accomplished fact.
Asbāb are means or ties of connection, whereas rimām are worn or fragile cords. Their pairing suggests that neither strong nor weak links remain.