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

Chapter 43 of the Shri Sai Satcharitra continues the description of Sai Baba's passing, which began in the previous chapter. As detailed in this chapter, the author will complete the narrative by discussing several key events. These include how Sai listened to the Ramayana for his own benefit as his end neared, the planning for his Samadhi, the significance of the 'fall of the brick,' and a past incident where Baba appeared to be dead for three days before returning to his body. The chapter also reflects on the nature of a saint's passing, describing it as a self-willed act of merging with the true self and attaining an omnipresent, imperishable state.