وَقَدْ يَكُونُ الْفَاعِلُ مَعْنَوِيًّا، نَحْوُ: «زَيْدٌ فِي الدَّارِ قَائِمًا».
Translation: The agent/referent can also be semantic rather than an overt grammatical subject, as in “Zayd is in the house standing.”
Qāʾiman is a ḥāl even though the surface sentence has no overt finite verb. The underlying meaning is “Zayd is situated in the house while standing.”