There wasn't any way to properly avoid speaking until they got the hell out of there, though Tony didn't doubt one of them was childish enough to figure it out. That was one more way to be trapped, though, and he had enough to deal with between the magic and the dark. Her question was met with silence while Tony waited instead for answers of his own that he knew were coming. Everything still remained so dark when Wanda was done. Energy should have been something he was able to read, not feel, and nothing was out of the ordinary in the environment; stale air and low magnetic energy, but no increasing power.
"Ssh," was all he had to say, slowing his step to listen between them. There was something lighting the readings on his HUD, but it was audio input. A regular rumbling, steady with only a few spikes and falls and gradually growing louder as they descended. They didn't have much further to go before he could feel the expansion before them, well before he could properly see it. It remained just as dark, but with a point of light welcoming them into an impossible distance, spread much wider than their narrow corridor; there was no way they were still in that pyramid. Around them, the sound took shape; words of some kind, a chanting of many voices. Turning slightly to the nearest, the gentle glow of the RT illuminated the fall of a dark robe on a hooded man, the shadows of it distorting his face-- or maybe he really did have the snout of a cat, whose lip raised into a sneer as Tony stared and flashed pointed teeth as his chanting went on. It wasn't a language Tony recognized, but it was starting to make him queasy, that animal's mouth forming unlikely shapes. These weren't mutants; Tony knew that but couldn't say why. Like the sphinx, they weren't a part of any reality he knew.