«قُلْ لِوَالٍ: غَادَرْتَهُ بَعْدَ بَيْنِي سَادِمًا نَادِمًا يَعَضُّ الْيَدَيْنِ»
Tell the governor: I left him after parting, stunned and remorseful, biting his hands in regret.
Sādiman / nādiman creates an immediate sound echo. Yaʿaḍḍ al-yadayn depicts biting the hands in distress or regret. It is not a witnessed quotation from the governor; Abū Zayd imagines and mocks the effect of his trick. The rhetorical flourish depends on a predicted emotional reversal.