Bruce has always dealt with the occult from a fairly young age. From his experience with Gotham and all it's tricks, to Metas and the Vigilante activities, he'd been around the block. Magic wasn't quite an old friend, but he knew it well enough.
The fortune teller he hired for his Halloween Gala was clearly just a scammer, though, using vague answers and twisting them to be just specific enough. Reading body language and memorizing cards is all fairly easy to learn, too. Bruce knows all the tricks.
So when Dick, his oldest son, told Bruce to check out the tent next to the large doors leading to the garden, he wasn't expecting the Fortune Teller's fortune to be not only specific, but also true.
"How-"
Bruce cleared his throat, recovering quickly, giving a smile and really laying on the charm.
"How do you know all that? Fancy magic you have."