Post hoc states that one event led to the following event that came after it. Since event B came after event A, event A caused event B.
This is fallacy because there are things such as coincidences, and an event coming after one doesn't mean they have to be related in any way.
With the information given, I would say it is 0.8.
Answer:On the night of 23 October 1731 a fire broke out and many manuscripts were damaged, and a few completely destroyed. Beowulf escaped the fire relatively intact but it suffered greater loss by handling in the following years, with letters crumbling away from the outer portions of its pages.