«فَحَارَ الْحَاضِرُونَ لِبَدَاهَتِهِ وَاعْتَرَفُوا بِبَرَاعَتِهِ»
The audience was amazed by his spontaneity and acknowledged his mastery.
Ḥāra conveys being astonished or at a loss. Badāhah is readiness in spontaneous expression, while barāʿah means excellence or mastery in a craft.
At first the gathering doubted him; after witnessing the contest, they changed their stance. The shift is the narrative payoff of the trial he proposed.