A warrior is visiting town when a storekeeper insults his honor, which means that the warrior must challenge the man to a duel. He walks up to the storekeeper and draws his blade. Suddenly, the storekeeper cringes in fear and then transforms into a giant rat-like creature that tries to escape through a window. The warrior is disgusted by the wretched monster and attacks.

required:
Who are the protagonist and antagonist in this story? What is the source of the conflict? Also, what does the conflict tell you about the cultural values of the society that this story comes from?