جَاءَ زَيْدٌ حَامِلًا حَقِيبَةً.
Both ḥāmilan and ḥaqībatan are accusative, but the first is ḥāl while the second is the object governed by the participle.
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Ḥāl Is Not the Object
Ism al-Fāʿil: Formation, Governance, Conditions and Time
جَاءَ زَيْدٌ حَامِلًا حَقِيبَةً.
Both ḥāmilan and ḥaqībatan are accusative, but the first is ḥāl while the second is the object governed by the participle.