What is the purpose of “wa-hādhā sharṭun lā yuhmalu” inserted into the sentence?

Supplementary Practice 13: Attribution, Quotation and Evidential Restraint in Rhetorical Analysis

• An independent reminder that the condition must not be neglected
• Treat the inserted sentence only as a time-related circumstance
• Treat it as a generalizing epilogue at the end
• Make it the indispensable predicate of naḥnu