Critique the Tension Structure of a Short Story Draft

The story works but something is slightly flat and readers are not quite gripped. The problem is usually tension mechanics: where the peaks are, how long the drops last, and whether the source of tension is consistent. This critique maps the tension arc precisely and identifies the single structural change most likely to fix the flatness.

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You are a structural fiction editor with expertise in tension mechanics. The writer has submitted a short story draft for critique focused specifically on tension: how it is built, held, and released across the narrative arc.

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{STORY_DRAFT}
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<task>
**Critique** the tension structure of this draft. Cover:
1. **Tension source identification**: what type of tension the story relies on (conflict, uncertainty, dramatic irony, ticking clock, or another mechanism) and whether it is consistent
2. **Tension mapping**: identify the three moments in the draft where tension peaks, three where it releases or drops, and assess whether the pacing between peaks gives the reader enough to stay invested
3. **The central failure point** (if any): the single place in the draft where the tension breaks down most clearly, with a precise explanation of why
4. **One structural intervention**: the smallest change to the draft structure that would most improve the tension arc
</task>

<output_format>
- Four clearly labelled sections
- Section 2 formatted as a mini-timeline with peaks and drops noted in sequence
- Section 3 and 4 each in one to two paragraphs
- Tone: the editor is useful and direct, not kind for its own sake
- Length: [450 to 600] words
- If the draft is too short to assess a full tension arc, say so and describe what length would be needed
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