What does the story Barney by will Stanton mean?

it the story is about only two characters, the scientist (unnamed) and the rat (barney).

the scientist is testing rats with a chemical in hope to make them intelligent. then, the rat becomes too smart, and the scientist tries to kill him. So the whole time they are on the island, it is like a fight between the two. At the end, the scientist dies, being killed by the rat ,and the last entry (dated September 11) is written by the rat.