Which analysis best describes stopping at “al-radā” and “al-akdār”?

Qalb, Tashrīʿ and Luzūm Mā Lā Yalzam: Completing the Verbal Ornaments

• They are separate prose-unit endings
• The first completes one description and the later adds another
• The first is a question and the second its answer
• The two words reverse into one another