How does waw in “Khalid attended and Sa‘id left” differ from “Khalid and Sa‘id attended”?

Particles of Meaning: Waw, Fa, Thumma, Bal and Lakin

• The first joins two clauses; the second shares one predicate between two persons
• Both perform one identical act in the first
• The second necessarily puts Khalid first
• Waw establishes immediate succession in the first