What extraordinary yogic practices of Sai Baba are mentioned in the beginning of Chapter 7?

The introduction of Chapter 7 alludes to some of Sai Baba's profound and extraordinary yogic abilities. It mentions his practice of Khanda-yoga, which is described as the disjointing of his limbs, where his hands, feet, and head would be separated and then joined back together as before. In addition to this remarkable feat, the text also notes his experiments with yogic cleansing techniques like Dhauti (cleansing of the stomach) and Poti. These practices are mentioned as examples of how he toiled for the benefit of others and even wore out his own body, bearing the sufferings of his devotees.