How does idhā lāqaw katāʾiba muʿlimīnā link to the next verse?

ʿAmr ibn Kulthūm: Challenge to Banū Bakr, Armour, Horses, and Protection (verses 75–91)

• It states the pledge condition completed in the next verse
• It dates a peace agreement
• It is only a negation
• It only gives lineage