What did Koly believe Sass would surely kill if she didn't fight back?

Koly believed that if she did not fight back against Sass, she would surely kill her spirit. This reflects the deep emotional toll that oppression and mistreatment can have on an individual. Koly's struggle is not solely for physical survival but also for the preservation of her identity, her strength, and her sense of self. In the context of "Homeless Bird," fighting back symbolizes her refusal to accept defeat or allow someone else's harsh treatment to define her worth or diminish her inner vitality. This emphasizes the importance of resilience in the face of adversity and highlights how crucial it is to maintain one's spirit despite external challenges. The other choices, while they represent significant aspects of a person's life, do not fully capture the essence of Koly's internal battle as directly as the concept of her spirit being at risk.