«رُوَيْدَ زَيْدًا»: Zayd is an accusative object.
«هَيْهَاتَ زَيْدٌ»: Zayd is a nominative subject.
The role depends on the meaning and governance of the verb-noun, not on whether a regular finite verb is visible.
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Comparing Two Source Examples
Asmāʾ al-Afʿāl — Definition, Uses and Parsing
«رُوَيْدَ زَيْدًا»: Zayd is an accusative object.
«هَيْهَاتَ زَيْدٌ»: Zayd is a nominative subject.
The role depends on the meaning and governance of the verb-noun, not on whether a regular finite verb is visible.