Jack's realization of the precise implications of Charlie's backstory. To quote:
Jack: [Charlie] summoned a perfect warlord. One whose Fate was to destroy the 'Wicked Witch' of the story. And she did. It was inexorable. Charlie must have set her loose in the world, then watched her hunt down Overlady Blair, the most powerful Ruler in the land, letting nothing stop her.
Parson: And now he's got one of those coming after him.