Batman had seen everything, but not quite everything, because he could not hear Original Schiller's voice. He had only seen the images.
Schiller had been taken away by unknown individuals, and Batman had no time to track him through surveillance footage. After all, the other side was very likely made up of professional agents who knew how to avoid cameras. And to chase them through surveillance, someone would have to sit in front of the monitors and report their location in real time. The entire process would involve delays. Batman had a better method.
He could use Mad Wine directly to enter Schiller's dream. The other Schillers in the High Tower of Thought could tell Batman exactly where Schiller's body was. That was much faster than chasing after an agent's ass.
He had arrived at just the right time, catching Schiller as he began playing the recording magic stored in the medal. However, because the audio and video channels were separate, only Schiller could hear the sound while seeing the images. Batman could only see the images.
But that did not stop Batman from deducing what was going on.
The calendar on the wall in the first scene had already revealed the time. It was Christmas of 1991. Yet the next scene jumped back to Berlin decades earlier, and Schiller had become a child again.
At that point, Batman had assumed the entire sequence was a flashback. The scene where Schiller committed suicide, which he had seen earlier, was a prophecy, and the story had then gone back to recount Schiller's life.
But the more he watched, the more wrong it felt. Based on the path taken by the young Schiller, he should not have become a soldier. He should have become an agent. Those were vastly different things.
Moreover,