"I wasn't aware I was supposed to keep track of my dreams." It's offered in what's pretty much the driest of deadpans, for all that it does neatly imply that either his Focus is vague enough that he can't figure out what it had been meant to be, or that this too is something that has vanished into the void that is his memory. But just at the moment he isn't too concerned with it.

(He may be so later, when he gets a more proper explanation, but that's something for later. Right now, he's mostly figuring it's not too important.)

Instead, he nods at both the brands and the explanation, even though a brief flicker of confusion stirs at the back of his mind. He knows this isn't the first time he's used magic, not by anything even remotely like a long shot, and he's pretty sure he'd been using magic even before he'd ended on Pulse. So either this isn't the only place that these fal'Cie can be found or there's something else going on here. But he very literally doesn't have the answers and he knows better than to try and pull something out his memory when there's so clearly nothing there. Perhaps time will have the answers, and if not, so be it.