Ulquiorra observed the man as he spoke, looking for any sort of sign that he might be lying, but finding none. It seemed ridiculous and impossible though, for there to exist anything outside the human world, Soul Society and Hueco Mundo. But he couldn't exactly deny that this place existed as he could touch and see it.
The only signs of him being frustrated was his tail flicking back and forth as he thought. The expression on his face stayed calm and unreadable. "I see..."