Find a quote that gives insight to the significance of nature to this chapter, please?

"One little grey bird, with a white brest, Pearl was almost sure, had been hit by a pebble and fluttered away with a broken wing. But then the elf-child sighed, and gave up her sport because it grieved her to have done harm to a little being that was as wild as the sea-breeze, or as wild as Pearl herself." How are the bird and its fate significant to the novel?

Chapter 15