Question: who was the killer in the movie snowman
[{'answer': 'Mathias', 'provenance': [{'wikipedia_id': '47819324', 'title': 'The Snowman (2017 film)', 'start_paragraph_id': 5, 'start_character': 202, 'end_paragraph_id': 5, 'end_character': 209, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '47819324', 'title': 'The Snowman (2017 film)', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1023, 'bleu_score': 0.7769888055563091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7263389254628195570}, 'section': 'Section::::Plot.\n'}]}]