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Just an idea but what's to stop you from writing things out of chronological order? The initial hero may turn villain 1/3 the way through chronologically but you could choose to write two distin...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43212 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Just an idea but what's to stop you from writing things out of chronological order? The initial hero may turn villain 1/3 the way through chronologically but you could choose to write two distinct time lines, one following the initial hero's decent into villainy and one following the second hero where this time line will intercept at the climactic moment the former and latter heroes meet. By Separating the time lines and skewing them you could have the plot twist happen at just about any place in your story.