"It's strange, really, this is Raccoon City, the domain of the zombies, so just how did that Goblin Merchant manage to get in here?"
Zhang Yanhang had previously been running around Raccoon City to unlock the map and didn't see any monsters other than zombies. Coupled with the eerily distinct border between the Goblin Plain and Raccoon City, Zhang Yanhang had reason to believe that monsters should only stay in their own territories and not wander aimlessly into the domains of other monsters.
"So what exactly is the reason behind the Goblin Merchant's entry into Raccoon City?" With insufficient data samples and only the Goblin Merchant as an example, Zhang Yanhang was unable to deduce the truth and answer from a single entity.
However, he felt that such issues could totally wait until he encountered more erratic monsters in the future. Only by encountering enough anomalously wandering monsters could he discover their commonalities and ultimately deduce the truth and answer.