بِحَيْثُ لَوْ سُلِّطَ عَلَيْهِ هُوَ أَوْ مُنَاسِبُهُ لَنَصَبَهُ، نَحْوُ: «زَيْدًا ضَرَبْتُهُ»، فَإِنَّ «زَيْدًا» مَنْصُوبٌ بِفِعْلٍ مَحْذُوفٍ مُضْمَرٍ، وَهُوَ «ضَرَبْتُ»، وَيُفَسِّرُهُ الْفِعْلُ الْمَذْكُورُ بَعْدَهُ، وَهُوَ «ضَرَبْتُهُ».
Translation: Were the later verb applied directly to the initial noun, it would govern it as accusative. In “Zaydan ḍarabtuhu”, the initial Zayd is governed by an omitted verb explained by “ḍarabtuhu”.
The fronted Zayd is not directly governed by the spoken “ḍarabtuhu”; that spoken verb already has “-hu” as its direct object.