The ground beneath Hermione and Luna shuddered. It felt like an earthquake. The tiles wrecked in half and shattered in pieces as if the ground was splitting open. The ground was sinking lower. Draco and Blaise stared at them with shocked expressions. Both Hermione and Luna found it hard to stay on their feet, and soon they were both on their knees, trying to stay in place. Draco was about to run back but they were so below the level of the room they were in that jumping off now would be disastrous.