Fright
Gregory walked slowly, in his left, one could see the muddy water with garbage floating on the surface.
Dust falls above him, which made his hair dirty. And different kinds of odors that came from the water, stool, and garbage assaulted his senses.
From his side view, he only sees the wall filled with black mud.
Gregory looked left and right as he treads carefully. 'People won't really suspect if the monster used this place to walk around the city. And even if they know, they probably won't dare to come down. Such a narrow place... They would only become food for the monster.'
Gregory raised his hand and covered his nose. He might not last even for a minute if he let the scent enter his nose like that.
Just now, he already felt his stomach churn, and turn upside down.
He felt that if he smells the sewer again. He would straightly vomit the content of his stomach and the food he ate from earlier.