How did Sai Baba's leela with the Ganga and Yamuna water unfold for Das Ganu?

This incredible leela, or divine play, is detailed in Chapter 4. Das Ganu, feeling a desire to take a holy bath in the Prayag on a special day, went to seek Sai Baba's permission. Baba told him there was no need to travel so far, stating, "This itself is our Prayag; keep firm faith in your mind." In a truly miraculous event that followed, as Das Ganu bowed down to Baba's feet, water representing the sacred rivers Ganga and Yamuna began to drip from both of Sai Baba's big toes. Witnessing this divine manifestation, Das Ganu was completely overcome with emotion and gratitude, with tears flowing from his eyes, and his speech became inspired to sing of Baba's power.