Batman's fingers around the cup trembled slightly, but he quickly turned his gaze back to the cabinet holding personal belongings.
The emotion that suddenly rose within him made him pause. Batman did not know what exactly he was so excited about, but he felt that he had indeed made the right decision.
Batman had no intention of following Zatanna's plan completely to trick Schiller out of his umbrella, because he knew it would never work. But he did need a way to enter Schiller's memories. Batman's goal was to find his weaknesses.
Around a few months ago, when the reconstruction project had just begun, Batman had started revising his contingency plans for everyone in Gotham.
Most of those plans had been completed within a month, but a few targets had given him a terrible headache. Schiller was not among them, because what he felt toward Schiller went far beyond a headache.
After the pathological personality had appeared last time, Batman had realized that Schiller might indeed have Dissociative Identity Disorder. He had more than one personality, so naturally, no single all-purpose plan could deal with him.
Of course, Batman believed that if Schiller had ten thousand personalities, he could make ten thousand plans. That was not difficult for him. But first, he had to figure out exactly how many personalities Schiller had, and what weaknesses each of them possessed.
Unfortunately, many of Schiller's personalities had only appeared before Batman in fleeting glimpses, leaving him almost no time to observe their weaknesses. So when Constantine proposed using Zatanna's abilities to enter Schiller's memory space, Batman knew the opportunity had come.
Naturally, this was risky, but Batman had never feared taking risks. He had considered the consequences of angering this professor, but he no longer cared, because he already had his diploma.