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Mutation: Just the Two of Us

This mutation is based on two player coop with extra 'rules'

- Survivors can crawl when incapped.
- One incap before black and white (so use that health kit wisely).
- No rescue closets
- Altered survivor glow (yellow).
- Altered healing stats (faster, and more affective). Revive speed has also been increased.
- Players retain green health above 25%.
- Leaker has a slight chance of spawning.