Question: where did the battle between beowulf and grendel take place
[{'answer': 'Heorot', 'provenance': [{'wikipedia_id': '3833', 'title': 'Beowulf', 'start_paragraph_id': 2, 'start_character': 135, 'end_paragraph_id': 2, 'end_character': 141, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3833', 'title': 'Beowulf', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 681, 'bleu_score': 0.9839344367380701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2226501047848464397}, 'section': 'Section::::Summary.:First battle: Grendel.\n'}]}]