Final answer:
In the story, the GOOD brother's spirit defeats the EVIL brother after he kills Sophie through remorse and repentance.
Step-by-step explanation:
In the story, the 'GOOD brother' represents the forces of good and righteousness, while the 'EVIL brother' symbolizes sin and wickedness. After the EVIL brother kills Sophie, it is implied that the GOOD brother's spirit defeats the EVIL brother through remorse and repentance.
The GOOD brother realizes the gravity of his actions and feels guilty, as shown by his desire to hide the corpse of his brother like the crow did. This demonstrates his repentance and desire to atone for his sin. Although the story does not explicitly state how the GOOD brother's spirit defeats the EVIL brother, it implies that through remorse and the intention to change, the GOOD brother can overcome the evil within him.