This quote shows power because it shows the fear in her. It shows that she knows she'll already be hunted, and showing weakness is just going to make her everyone's first target. She is aware of the brutality of her world, and she's just trying to survive it.
I can't type you a whole essay but i can give tips for each paragraph so you know what to write about. P1: introduce topic - tsunami P2: describe how it starts P3: describe how it ends P4: describe after effect P5: conclude with interesting fact