What is figurative about lā tukālu al-dimāʾ?

al-Ḥārith ibn Ḥillizah: Ḥujr, Royal Kinship and the Dhū al-Majāz Covenant (verses 56–67)

• Comparing rain to a sword
• Calling a mirage a captive
• Calling a dowry a horse
• Representing blood claims as something measured