Metaphorically concluding, Amir hasn't met his biggest Bear yet. With Hypothetical deduction, In this question you're left with the statement that despite Baba's Inhuman Like strength and manliness that left him fearless He couldn't fight His biggest bear? So why would Amir even have the courage to acknowledge the bears existence? But with leaves the only option of Amir's biggest bear being one that Baba himself couldn't shake, Death, or Maybe God? Having already concurred Assef, And with the attempted Suicide of Sohrab comes the Prayer of Amir. This is possibly Amir's clash with the "Bear" fighting words of Baba and the hovering hand of God, whom Amir chooses To fight with his Prayer.