Question: who played the demon in buffy once more with feeling
[{'answer': 'Emma Caulfield', 'provenance': [{'wikipedia_id': '251815', 'title': 'Once More, with Feeling (Buffy the Vampire Slayer)', 'start_paragraph_id': 5, 'start_character': 673, 'end_paragraph_id': 5, 'end_character': 687, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '251815', 'title': 'Once More, with Feeling (Buffy the Vampire Slayer)', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 862, 'bleu_score': 0.985662154730604, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7558126585079794939}, 'section': 'Section::::Background.\n'}]}]