Minato had been stunned when he was addressed earlier on, and after complying with the order now was paying even closer attention to the situation at hand more than he had previously--away from how numb his legs were from the climb through the stairs, and bemoaning the necessity of dramatic architecture. (At least, he asked about the door nicely.)

This was already far from a normal welcoming conversation; hopefully they'd be able to maximize on answers that would shed more light on their limited understanding of this world and the scenario they were fighting against. It was against his usual nature: being, to let others do the talking, but something the Sage mentioned bothered him. He may as well speak up now, before the opportunity to mention it passes.

"How do you exist, if you embody nothing? ... And how many more Avatars are there?"