Night had been ready to attack since the group stepped into the sky. Its intentions weren't casual. Its peculiar existence made it hard to notice by Heaven and Earth even in its normal form, so it was basically invisible after adding a layer of dark matter containing the dark metal.
Noah inspected the pieces of the world brought back by Night after returning inside the tunnel. The gaseous stage cultivator killed by the Pterodactyl didn't belong to Heaven and Earth's system. She was one of the privileged experts, but the abrupt attack from a being that she couldn't see had destroyed her on the spot.
Night was as deadly as always, but the surprise experienced by the expert when she noticed Noah and King Elbas had played an important part in her death. The Pterodactyl had a clear path to its target, and it exploited that chance perfectly.