Batman couldn't read minds. He didn't have X-ray vision, or magic. He couldn't fly or teleport. All he had was a well-trained body and an agile mind coupled with a keen sense of observation. So he didn't need to be able to read minds to pick up on hints in the way Schuldig held him, the way he'd asked for this. So that's how it is, is it? He took a less direct path back than he might have, but said nothing, did nothing else. No visible reaction at all, but he was good at that.