"Perhaps he... um, didn't want you to hear about this so easily." Which doesn't exactly make Reynard look better, and Ghost knows it. That's why it's offered tentatively, and then because Adia wants an explanation. Ghosts are literally programmed to supply those, after all...

"The only way to find out is to ask him," Blaze says. Not scolding Adia, not even trying to push her in any way. It's just the simple answer, in her view, and no way around it. Not if Adia decides it's worth her while to know.