For a long time neither of them spoke. Then Garanin sighed and said, “How did this happen? The Wallfacers’ privilege of sealed-off strategic thinking was meant to be used against the sophons and Trisolaris. But you and Tyler both used it against humanity.” “There’s nothing strange about that,” Rey Diaz said. He sat next to the window, enjoying the sunlight shining in from the outside. “Right now, the greatest obstacle to humanity’s survival comes from itself.”