Why did the bird beat louie zamperini?

The bird, a sadistic guard named Mutsuhiro Watanabe, tormented Louie Zamperini during his time as a prisoner of war in Japan. Watanabe's brutal treatment stemmed from a combination of personal insecurities and a desire to assert power over the prisoners. Despite the physical and psychological abuse, Zamperini's resilience and spirit ultimately allowed him to survive the ordeal, highlighting the triumph of the human spirit over adversity.