The Batman Who Laughs kept thinking, endlessly running through every possible response Batman might make. He had thought so hard that his brain was practically smoking.
After repeatedly using Bruce's mindset to deal with his opponent and suffering one failure after another, The Batman Who Laughs finally realized that he was not dealing with a traditional Bruce. When making plans against Batman Dragon, his opponent might very well do things that even he could never predict.
He had to discard his previous way of thinking and reexamine his plan from every angle.
For now, the situation was completely under control.
Batman Dragon had definitely thought of summoning Bat-Mite.
His opponent had certainly intended to use a Fifth-Dimensional Being to deal with all the difficulties he currently faced... Black Death Emperor, The Batman Who Laughs himself, and Emperor Joker. If he had not had such a thought, he would never have brought those mages to Reverse-Flash's world so decisively after discovering that he could not force his way into the universe containing the Spirit of Existence.
Because Reverse-Flash had repeatedly restarted the world, reality in this universe had already been turned into a mess by the Speed Force and the distorted timelines.
The hundreds or thousands of timelines erased by Reverse-Flash through his universe resets had not completely vanished. Instead, they briefly existed as Time Remnants.
Countless beings caught between being erased and not being completely erased had made this universe's reality as fragile as tofu through the power of their imaginations. This could greatly increase the odds of summoning a Five-Dimensional Being. As for the Reverse-Flash of this universe, Batman Dragon probably considered him the easiest teammate to recruit. With these two factors combined, Batman Dragon had come here.
And all of this was under The Batman Who Laughs's control.