What effect comes from fa-qālat, taqūlu, and fa-qultu?

Imruʾ al-Qays: Dialogue in ʿUnayzah’s Litter, Boasting, and an Oath (Verses 13–18)

• An unrelated list of names
• A vivid dialogue with changing speakers
• All verbs being passive
• Proof that the episode is in the future