Question: who is the actress that plays the darkness in supernatural
[{'answer': 'Emily Swallow', 'provenance': [{'wikipedia_id': '41248418', 'title': 'Emily Swallow', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '41248418', 'title': 'Emily Swallow', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 196, 'bleu_score': 0.9419661180380051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10833198107184564424}, 'section': 'Section::::Abstract.'}]}]