But Arkham Batman really could not be blamed for misunderstanding. With a plot summary like that, paired with the opening at the time, it was extremely misleading. Anyone would think the main storyline was to seal the devil away and then rescue the eldest son.
The main storyline might indeed have been that. It was just that Schiller still looked human, more or less, so people's first instinct would be to take him for the possessed eldest son. In that case, the more the devil was sealed, the closer the eldest son should be to an ordinary person, and the weaker he should become.
But in reality, the role Schiller was playing might not have been the eldest son's soul inside this body, but the devil's soul. That passive that made him stronger the more injured he was also followed the devil. The more the devil was sealed, the weaker it became, and the weaker Schiller became, the stronger he was. Doctor Manhattan, are you sick in the head?!
Arkham Batman complained, but complaints aside, he felt this was the level of difficulty he wanted. After seeing Schiller break through the door, he did not hesitate. He jumped straight down from the atrium, rolled after landing, slipped out of Schiller's line of sight, and ran toward the nearest side door.
He charged back into the garden, but he did not run deeper into it. Instead, he circled around, preparing to enter through the front door again. But just as he reached the front door, he saw Schiller waiting there.
He stood alone on the rain-soaked steps, his features dim and indistinct through the curtain of rain, but those gray eyes had been following Arkham Batman the entire time. And the emptiness and confusion in them had vanished. He had fully