How did Sai Baba's departure from his body differ from an ordinary death, based on the yogic explanation provided?

The text explains that Sai Baba's departure was not a death but a voluntary yogic process. Chapter 43 describes that Sai Samarth, who "could die at will," chose to burn his body "in the fire of Yoga." Instead of perishing, he merged himself into the unmanifest state while remaining present in the hearts of his devotees. This act is described as a part of the "spontaneous play of Yoga for the sake of the devotees' salvation." Therefore, his leaving the body was a conscious, controlled transition into his unmanifest form, fundamentally different from the involuntary process of ordinary death.