NSTD.3:5.2 - Worked example: franchise plot support

In a continuation-style storycraft probe, a scene says that a character betrays an ally “because the plot needs a darker turn.” That is a narrative-function explanation, not source support. Repair it as source structure:

NarrativeEventSupportRecord@CharacterTurn:
  eventOrMechanismClaim: character changes allegiance under named pressure
  sourceStructureRef: selected canon constraint, prior motivation, current dilemma, consequence chain
  relationStrength: a proposed motive consistent with the selected fictional premises
  reconstructionTarget: reader can state motive, pressure, action, consequence, and canon-return condition
  overclaimRisk: author need or theme is treated as character cause
  sourceReturnCondition: return to source pack and agency constraints

For a story whose events should follow intelligible motives, the author’s desire for a twist does not supply the character’s reason. Add a pressure, choice or event that makes the turn intelligible, or revise the turn. A deliberately unexplained or absurd turn has a different artistic aim and should be judged for that aim.