The Master of the Sea is wholly fickle. The longer she stands at the edge of the water, the more Hikari recognizes this. And somewhere in her soul is a content emotion recognizing of this fact. She is feeling less afraid the longer she stands here. At least, of him. Of the creatures falling inside the world, it is clearly different.
"Demon Lord," whispers the gurgling water, speaking in the thousands of voices of shipwrecked sailors, sirens without prey, the steady water taking their air. "Oh you are an interesting child. This is good payment."
The Master of the Dark Sea is fickle. He goes along with her idea because he is curious and just as quickly could take her away for his own, whatever that would entail. For his own reasons, he doesn't.
She hears the cries and the screams, but she doesn't turn. It will break the spell. It will break the pink light turning red and foamy like the sea. It will break the litany of howls. She is the light. Light cannot be caged.
Hope will not allow it.
She hopes Takeru remembers that.