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

The introductory section of Chapter 7 alludes to Sai Baba's incredible yogic powers and mastery over his physical form. It mentions his practice of Khanda-yoga, which is described as the ability to disjoint his limbs. According to the text, this practice involved experiments where his hands, feet, and head were separated from his body and then joined back together as they were before. The chapter also makes a brief reference to other advanced yogic techniques like Dhauti, which is a method for cleansing the stomach. These practices highlighted his supernatural abilities and how he even bore the sufferings of his devotees.