Question: who does christian bale play in howl's moving castle
[{'answer': 'Howl', 'provenance': [{'wikipedia_id': '3903364', 'title': "Howl's Moving Castle (film)", 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]