What syntactic difference does “huwa” create in “dakhala al-bāḥithu wa-huwa yaḥmilu ...”?

Supplementary Practice 10: Rhetoric of Claim, Evidence, Objection and Reply

• Yaḥmilu necessarily becomes past tense
• It permits a nominal clause whose predicate is verbal
• The owner of the state necessarily becomes a direct object
• Wāw loses every possible function