What does wāw chiefly do in jāʾa Zaydun wa-huwa ḍāḥikun?

Appendix to Faṣl and Waṣl: Circumstantial Clauses, Wāw and Pronominal Linkage

• Report two arrivals
• Introduce an oath
• Link the later clause as a circumstance of the arrival
• Turn the subject into an object