What is the story of the mysterious Tanga and Sipahi mentioned in the text?

Chapter 33 details a wondrous event where a devotee named Ramgir Buwa arrived by a Tanga (horse-cart) accompanied by a Sipahi (guard). When Ramgir asked Nana about the Tanga, Nana was confused, stating he hadn't sent one and had no idea Ramgir was coming. It became clear that the Tanga and Sipahi were a mysterious arrangement. The text describes this as an act of the 'motherly Sai,' who is a 'skilled actor' and comes running to the aid of devotees in times of crisis, demonstrating Baba's profound and protective affection.