what does amir mean ehen he says i can never tell baba from the bear

The story about Baba and the bear was a neighborhood legend, which Amir had later taken to represent any trouble Baba went through. When Baba died, Amir called his cancer "the Bear he could not defeat." The dream is full of symbolism on many levels. One one level, Amir is Baba and Assef is the bear. Amir describes how "Spittle and blood fly; claw and hand swipe." He even says, "They fall to the ground with a loud thud," which also describes the moment just before Sohrab saved Amir. Amir knows that by escaping, he has bested Assef just as Baba supposedly killed the bear. On another level, the dream is about Amir coming to terms with his guilt, which the bear represents. When he puts himself in grave danger on Sohrab's behalf, Amir is challenging his guilt-challenging the bear.