A common enough error is to assume a shared memory of a situation. More often than not a “consensual reality” is not a part of the equation. Every person will see or hear or remember that which ((snippets: is most convenient to them, and they will fill in the missing pieces based on their own internal models and experiences)). In particular, if something about the situation is unusual (breaks a template), the rough or new edges would likely disappear, in order for the events to fit into a simpler and smaller and familiar representation. Contributing to such confabulations are the optimization principle and the fear of the unknown.
In school we might have been taught to think logically and to see which conclusions follow from the facts. But therein lies danger of a mentalization failure due to the naive belief in a shared fact. A better first question might be: how the situation would fit the person’s existing templates.