Reread the last paragraph of chapter 78, p. 217.

While at sea, Pi and Richard Parker face many challenges, traumas, tragedies, and miraculous occurrences. They never have sufficient food and fresh water, and the constant exposure is highly painful. A severe storm, which they miraculously survive, destroys the raft. Pi manages to capture and kill a bird. They are almost crushed by an oil tanker, which then passes by without seeing them. There is also a sense of irony in Pi's relationship with his animals. This proves both a paradoxically high and low point of the story. During an especially severe period of starvation, Pi and Richard Parker both go blind. While blind, Pi hears a voice, and realizes that they have drawn near another lifeboat that contains a similarly starving and blind Frenchman. Pi and this man converse for a while, and bring their boats together. The Frenchman climbs onto Pi’s boat, and immediately attacks him, planning to kill and eat him. He doesn’t realize that there is a tiger on the boat, however, and accidentally steps into Richard Parker’s territory. The tiger immediately attacks and kills him. Pi, saved at the cost of his attacker’s life, describes this as the beginning of his true moral suffering.