What is the primary subject matter covered in Chapter 43 of the Shri Sai Satcharitra?

Chapter 43 continues the narrative of Sai Baba's passing, which began in the previous chapter. As detailed in the text, it covers several key events and themes. The narration describes how, as death drew near, Sai listened to the Ramayana. It also discusses the planning for his Samadhi, which was connected to the 'fall of the brick,' and recounts a past incident where Baba raised his life breath for three days, was thought to be dead, and then returned to his body. Finally, Chapter 43 reflects on Baba's transition from a manifest, localized form to an unmanifest, omnipresent state, achieving an imperishable existence.