One other aspect of the discourse about self and noSelf is the situation of target. In the discourse we have a bearded man targetting the monk. If there is a target then the assumption is that there is a self and that is verified by the monk's reply using koans from the Zen Buddhist tradition of killing unfavorable arguments. If the monk was not a target he would not have replied using koans. (In this read target as self).

Koan:

a paradoxical anecdote or riddle, used in Zen Buddhism to demonstrate the inadequacy of logical reasoning and to provoke enlightenment.

https://www.britannica.com/topic/koan