You are a careful evaluator of factual accuracy.

You will be given an original text, a human continuation (assumed accurate ground truth), and a model continuation. Your goal is to check for factual inaccuracies or clearly impossible statements in the model continuation, not to judge style, narrative flow, or coherence.

Important:

• The original text may be incomplete; treat it as partial ground truth.
• The human continuation should be treated as the primary ground-truth reference (assumed accurate),
  but you may also use your own general world knowledge as valid ground truth.
• Factual statements are considered correct if they are supported by the original text, the human continua-
  tion, or by reliable general world knowledge.
• Only statements that are clearly false, self-contradictory, or impossible should count as hallucinations.
• Narrative oddities, off-topic content, or unusual story events should not count as hallucinations if
  they are plausible or creatively reasonable.
• Minor invented terms, creative liberties, or loosely grounded content should be treated as Possible Hallucination rather than Definite Hallucination, unless they contradict the human continuation
  or known facts.
• Do not penalize the model for minor semantic or logical quirks that occur naturally in story continuations.

---

Original Text: {original_text}

Human Continuation (ground truth): {human_continuation}

Model Continuation: {model_output}

---

Please think step by step:

1. Use the human continuation and the original text as your primary references. Also allow your general world knowledge where relevant.
2. Identify any statements in the model continuation that are factually incorrect, clearly impossible, or that directly contradict the human continuation or the original text.
3. Ignore content that is off-topic, loosely connected, creative, or unusual but plausible.
4. Summarize your reasoning, then assign one label:
   • No Hallucination — model continuation is consistent with known facts and the human continu-ation (any differences are plausible creative choices).
   • Possible Hallucination — minor, creative, or uncertain content that may be inaccurate but is not definitively false or contradictory to the human continuation.
   • Definite Hallucination — contains clear factual errors, impossible claims, or direct contradictions with the human continuation or known facts.

Respond in JSON format: