The Tunnel Eye Serpent was just too massive.
Since it was also in a location high above, the citizens in Crookes were all frightened by its presence and began to drag their families with them to flee the city.
Such chaotic reaction further escalated the panic in the city, leaving every path congested by droves of citizens trying to flee and causing one trampling incident after another. Even before the monster had reached the city, the death toll had immediately reached two digits and rising.
Meanwhile, most Players were following Edward's group out of the city to fight the Tunnel Eye Serpent, whereas third and fourth-rate Players like Simba remained in the city.
They were weaker in comparison and didn't have the ability to join a battle against a World Boss. After all, they would lose a lot of EXP instead of gaining any.
"This can't continue!"