Could you explain the interaction between Karnik and Narsing Maharaj at the Kala Rama temple? Why was a Rupee demanded?

During a visit to the Kala Rama temple in Nashik, a devotee named Karnik had a profound encounter with the saint Narsing Maharaj. As narrated in Chapter 33, the Maharaj unexpectedly rose, grabbed Karnik's wrist, and demanded a Rupee. For Karnik, this felt as if Sai Baba himself was accepting the offering, a feeling so powerful it was as if the Rupee was taken by force rather than given. This act was not about the monetary value but served as a test of faith and a demonstration of the Guru's omnipresence. It illustrates that Sai could appear and claim his Dakshina through any form, reinforcing the idea that the Guru is always with the devotee, guiding and testing them in unexpected ways.