What is the ruling if witnesses disagree on the time or instrument used in the killing?

Primary text

The testimony is not complete if one witness testifies the killing occurred in the morning ('udwah) and the other in the evening ('ashiyyah), or if one testifies it was done with a sword and the other with a stick. This is the position of the Shafi'i school. This is because each witness contradicts and invalidates the statement of the other, as killing in the morning is a different event from killing in the evening, and one cannot simultaneously kill by one instrument and then by another, unlike the case of intent versus accident where the physical act is singular and the dispute concerns the unseen intention.