Well, there was a long period of time in which nothing happened. Whatever was going down up above was unfolding slowly, like some long, awkward pause.
The shaft left Wheatley and his newly acquired winged friend at the observatory, which looked…pretty good. No really. No blood on the walls, no stains, not even a perfectly settled layer of dust. Books on the massive shelves around them were all neatly organized, and a large balcony behind rustling curtains allowed fresh air from outside to carry in. The fireplace was lit, but it crackled quietly.
Oh! This is…rather unexpected, isn't it? Rather suspicious. He looked about for his friends, only to see a silhouette behind the curtain. One that was shaped an awful lot like a full-grown human male and not a monster. Wheatley rolled over until he went through the curtain, but upon doing so, he realized there was nothing there. The balcony was partially collapsed, and it had the age and decay that was absent from the room he just came from. "Definitely suspicious." Wheatley's pupil shrank when he spun about, realizing how dark it suddenly was. Even the light that was supposed to be behind that curtain from the fire going in the conservatory was absent. "Hello? Hello!?"
"You've met a terrible fate, haven't you?"
Rotating towards the sound of the voice, Wheatley beheld what looked like a small wooden statue of a boy in green with pointed ears and an unsettling face. He backed away, only to run into one that had appeared right behind him. "Arahaagh! What's going on!? Leave me alone! I just want to go home!" On second thought, home was the least of his desired places to be. A homicidal-insane disc operating system wanted him to suffer back there, and she was in charge of the place. He was so frightened, he backed through the curtain again, only to find that the cozy observatory he left was now full of those wooden statues of that same awful boy.
"You shouldn't have done that."
"WHAT? WHAT? SHOULDN'T HAVE DONE WHAT? I take it back! Whatever it is I did, I take it back!"
But statues continued to appear out of thin air, weighing the rotten wooden floor of the circular room. The stress was audible. The sound of it creaking as it was slowly giving way only fueled Wheatley's panic. While it started snapping, his eye stared straight up at a pair of gleaming eyes that glared back down at him. The creature it belonged to was impossible to see due to the lighting, but it was then that the core was certain of its doom.
As the floor beneath him crumbled and gave way, Wheatley fell into the darkness below, screaming all the way down, able to still hear the voice that called after him despite his yelling.
"You shouldn't have seen him, Wheatley."