A lot of people feel anger in this book. Janner is angry about taking care of Tink and Leeli, and about Nia and Podo keeping secrets. Oskar is angry about Skree being overrun by Fangs. Podo is angry at Peet. Nia is angry at Podo. When is that anger fair, and when is it unfair? When is it dangerous to hold onto anger? Is anger ever a good thing? Can it be useful? How?