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Complete resolution of a crisis would be a DXM. Pushing the story in a new direction (by creating another crisis that would need to be resolved) is all right. As far as I can see, your twist can m...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/34243 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Complete resolution of a crisis would be a DXM. Pushing the story in a new direction (by creating another crisis that would need to be resolved) is all right. As far as I can see, your twist can mean two things - either the villain is not that bad, or he's actually worse - and freed protagonists are farther away from reaching their goal. If it is the former, you'll need to show motivation for the protagonists to continue their fight, and for readers to keep rooting for them. If it is the latter, you need to be careful to show the end of Act II as an actual loss for protagonists, and why would the villain be so convinced of his victory.