Or was it because, starting at 21:00, the Teaching Building changed in nature from a "Teaching Building" to a "Night-Walking Species Nest"?
Both sides of the classrooms had Military-Grade Blast-Resistant Glass, and the classroom doors were secured with lock after lock... suddenly, all of that seemed explicable!
He had already known it was dangerous outside the classrooms after 21:00, but now he knew what made it dangerous!
Lin Yi's pupils contracted, but clearly, although daytime was not the Night-Walking Species' home turf, and they all maintained a "sleeping" state in some fashion during the day, they could still wake up and become active under certain special circumstances.
Like impersonating someone else in the Bathroom...
Or waking up when the elevator doors opened...
Just then, he suddenly saw wisps of barely perceptible green vapor drifting off Li Huiyuan. They were invisible to the naked eye, but in his current vision, they were as clear as a beacon!
"She's smoking? Wait!"
Something suddenly occurred to Lin Yi, and he jerked his gaze down at himself...
Then he discovered that green fog really was seeping out of his own body, little by little!
But precisely because it was right under his nose, he had never noticed his own problem before!
"Fuck!!"
"Was it the green fog coming off me that woke up that Night-Walking Species lurking in the corner of the ceiling?"
"But when did I start 'releasing' green fog?!"
"Or are there other reasons I don't even know about?"
Lin Yi's scalp prickled. Suddenly, he felt as though the Campus was full of whirlpools and traps, and one careless step through a trap had landed his foot in shit.
"Could... something else have happened to Maozi?"
"Has Maozi's contamination gotten worse?"
Lin Yi felt an intangible sense of pressure and danger. Mao