Later...
The criminals dispatched, the police called, Batman had been silent as turned to give the boy a look before taking to the roofs again and heading for the batmobile, even though it was hours earlier than he usually would have done so. He never turned to see if the boy was following him, but did watching in reflective surfaces to make certain; Batman wasn't going to lose him again.
At the car, he stopped and waited. Batman hadn't taken out the tank version tonight, but the sports car variant. Unlocking the doors and popping the passenger side, Batman got in, and started the engine.