Xion turned and looked over at Zatanna, curious. That sounded like she'd been here a while... hm.

"What do you mean?" she asked, before pausing and adding, "Did it have something to do with that... with who people've been telling me got defeated, not too long ago?"

The one that shouldn't be named, according to them. And after Bakura's reaction she's very hesitant to use the word "monster" in general.