They had merely switched from "invading the Campus" to "invading the Art Building"!
At its core, it was still an invasion!
Invaders were invaders. Invading somewhere else did not strip them of that definition, and even the passage of time could not change the fact of their invasion. A large proportion of the many Sculptures on Campus were bloody evidence of the Night-Walking Species' invasion.
The Night-Walking Species descending amid the howling winds and torrential rain from the phantom Art Building in that inverted sky were merely the least conspicuous part of it.
The rain in the Abnormal Weather was the true source of Contamination!
It seemed to be water from that black Ocean. For some unknown reason, its surging waves had invaded the Layers. After being crushed by the dimensions between the Layers, what remained was diluted in the real world, ultimately becoming rain.
Although only a tiny trace of its contaminating properties remained in the rain, the environment combined with the Night-Walking Species was enough to plant the seeds of Contamination in Experience Students stranded in it.
That was why the Rules repeatedly stressed that they had to take shelter in the nearest building or by a Streetlamp during Abnormal Weather!
Because the rain carried Contamination, and when the Abnormal Weather grew severe enough, torrents of Night-Walking Species would writhe and crawl through the darkness.
Light could drive away the Night-Walking Species, while buildings could shelter them from wind and rain.
Although it was indeed a little late to fully work out this logic only now, from a rigorous scientific perspective, moving from "conjecture" to "verification" was itself a tremendous step forward.
Lin Yi recalled the method Head Teacher 040 had told him for entering the fifth floor and above of the Teaching Building. Applying that to the