The historian must receive the testimony of both people, interpret what they told him and establish his own theory about the occurrence of the events. He might also do additional research looking for other sources of information.
Taking into account that each person tells the story in a biased way from her point of view. What the historian must do is receive the testimony of both people and try to understand in a general way how the events occurred.
Additionally, he can search for additional information about the occurrence of the events, dates, and stories to support his investigation and establish the chronological order of the events.
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