ثُمَّ أَدْبَرَ يَسْعَىٰ
Ayah summary
He turned away and began looking for magicians to confront Musa.
Sentence structure
ثُمَّ advances the sequence. أَدْبَرَ is the main verb, while يَسْعَىٰ describes his state as he turned away.
ثُمَّ — Then
Grammar: ثُمَّ is a conjunction.
أَدْبَرَ — he turned his back
Grammar: form IV third-person masculine singular perfect verb.
يَسْعَىٰ — striving
Grammar: A third-person masculine singular imperfect verb with understood subject هُوَ; its clause functions as a circumstantial expression describing how he turned away.