From Stark's perspective, when he connected all the clues they had gathered along the way, the first was that Schiller had not been controlled by Khonshu, the Moon God. This had not actually exceeded Stark's expectations by much.
He did not believe that someone with such a tall tower in the Mind Palace could be so casually controlled by a god. He had guessed that this was Schiller's setup, but after entering Schiller's Consciousness World, Schiller's past experiences still exceeded his expectations.
A child who had been about to overcome autism witnessed the murder of his parents just after regaining his ability to speak, causing him to lose that ability once again. No matter where such a thing happened, it could be called a human tragedy.
Later, on the second floor of the asylum, they witnessed how teenage Schiller had split off a serial killer personality because of his childhood trauma.
What saddened Steve and Stark even more was that the Doctor Schiller they had known before had seemed perfectly normal. Not only had he had no problems with speech whatsoever, but his abilities had even surpassed those of ordinary people by far. In particular, he had used the intelligence brought by his savant autism to advise human civilization, and he had already achieved quite remarkable results.
It could be said that even if Schiller had not been their friend, hearing such a story would have inspired them. It was human nature to be moved by anyone who stood on their own feet, strengthened themselves, and played a terrible hand well, drawing from their stories the motivation to keep moving forward.
But afterward, they heard from Khonshu that Schiller was investigating the Egyptian pantheon's secret of resurrecting believers. That gave them an ominous feeling, especially Stark, whose parents had died