Fast! : )

based on the text, why did people draw pictures of nessie after seeing a fence post?
people imagine things that are not really there.
some witnesses are more convincing than others.
there are far too few reliable images of nessie.
when faced with something unknown, people panic.

"People imagine things that are not really there" is why people drew pictures of Nessie after seeing a fence post. The tourists were either not expecting a sighting or were expecting a sighting too much. So when the fence post rose up in the water, the tourists imagined a monster instead of a piece of wood. Because of the myth of Nessie in Loch Ness, tourists were led to believe that what they saw was could only be a monster. 

Conflict is dissagreeence or compatibility