Polly tries to convince Zach that the People Across the Lake intend to sacrifice her for her blood, but he refuses to admit this. Polly escapes, but returns for Zachary's sake. Ultimately, Polly's spirit of self-sacrifice and love, accompanied by the timely return of rain on her captors' side of the lake, wins out as a better way to interact with the Divine than an offering of death.
Polly tries to convince Zach that the People Across the Lake intend to kill her for her blood, but he refuses to accept this. Polly escapes, but returns to save Zach. Ultimately, Polly's selflessness and love, along with a rain shower on the captors' side of the lake, proves more effective than a sacrifice in interacting with the Divine.