I was not suggesting one should not twist the story; that's natural and part of the fun. You just don't do it like a wrecking ball. The secret is in respecting the creation that precedes, and engineering a graceful transformation. Not just overriding past events, but leading them into a new passage without excessive dissonance. Any writer knows this problem.

Parallel characters, unexpected developments and new turns are welcome devices; not just overwriting someone else's construction. The Unicorn alehouse thread provides some excellent examples of both sorts of sequence.

A