«فَتَظَاهَرَ بِاللُّكْنَةِ، وَتَشَاغَلَ بِاللُّهْنَةِ»
He affected a speech impediment and occupied himself with a quick morsel.
Abū Zayd delays a plain answer. Luknah denotes impaired or hesitant speech, and luhnah a small, hurried portion of food. Their sound play matches another evasive performance: he pauses through manner and appetite before revealing his explanation.