Can you describe the incident mentioned in Chapter 43 where people previously thought Sai Baba had died?

Yes, Chapter 43 recounts a specific past event to illustrate Baba's yogic power. On one occasion, he raised his life breath to the crown of his head, or Brahmarandhra, and remained in that state for three full days. People with 'certain minds', unable to comprehend this state of Samadhi, concluded that it was not a deep meditative state but death itself. Consequently, they began making preparations for his final rites. However, as the chapter narrates, Baba suddenly returned to his body, which startled everyone and demonstrated that his control over life and death was beyond ordinary understanding.