请你详细描述一下事故的经过。
记者问蜗牛：当时事故是怎样发生的？[{'character': '记', 'pinyin': 'ji4', 'highest pitch': 11.29, 'lowest pitch': 9.43, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '者', 'pinyin': 'zhe3', 'highest pitch': 9.43, 'lowest pitch': 6.63, 'duration': 0.22, 'prosody hierarchy': '#2'}, {'character': '问', 'pinyin': 'uen4', 'highest pitch': 8.9, 'lowest pitch': 7.03, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '蜗', 'pinyin': 'uo1', 'highest pitch': 10.63, 'lowest pitch': 8.24, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '牛', 'pinyin': 'niou2', 'highest pitch': 10.21, 'lowest pitch': 6.51, 'duration': 0.34, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.21}, {'character': '当', 'pinyin': 'dang1', 'highest pitch': 10.56, 'lowest pitch': 9.82, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '时', 'pinyin': 'shiii2', 'highest pitch': 10.38, 'lowest pitch': 8.13, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '事', 'pinyin': 'shiii4', 'highest pitch': 9.6, 'lowest pitch': 6.91, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '故', 'pinyin': 'gu4', 'highest pitch': 11.42, 'lowest pitch': 7.01, 'duration': 0.2, 'prosody hierarchy': '#2'}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 9.6, 'lowest pitch': 7.68, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '怎', 'pinyin': 'zen3', 'highest pitch': 13.63, 'lowest pitch': 3.85, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '样', 'pinyin': 'iang4', 'highest pitch': 10.82, 'lowest pitch': 3.98, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '发', 'pinyin': 'fa1', 'highest pitch': 10.31, 'lowest pitch': 7.41, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '生', 'pinyin': 'sheng1', 'highest pitch': 8.29, 'lowest pitch': 7.25, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 7.25, 'lowest pitch': 5.61, 'duration': 0.2, 'prosody hierarchy': '#4'}]