ضَرَبْتُ زَيْدًا مَشْدُودًا
Translation: I struck Zayd while he was bound.
ضَرَبْتُ: past verb built on sukūn before the subject tāʾ; -tu is the subject pronoun.
زَيْدًا: direct object, accusative by fatḥa.
مَشْدُودًا: accusative ḥāl describing the direct object Zayd.
Mashdūdan is not the striker’s condition: the bound person is Zayd, the object.