After absorbing the knowledge, Merlin reached for a handful of the loose sheets that were laying around at his feet. He attempted to read what was on the page, it seemed that the beginner knowledge was enough to understand the context, but there were a several words that most likely expanded the story into greater detail that he simply couldn't understand.
The general context he managed to figure out was that the vampire had one day suddenly found himself lost and alone in the forest. There was a specific passage that mentioned that this was a strange world where contact with sunlight caused the vampire's skin to burn.
Merlin believed this passage confirmed his theory that something strange and unusual was going on. The reason the vampire seemed out of place was because it actually was. The vampire had seemingly been taken from another world, or dimension, and plopped into this one without warning.