A lot of the elites were still actually sleeping. In fact, they needed to have a long time of rest because their bodies weren't used to the extraction process yet. Because of the crystals that sucked out all the miasma from them, their bodies got drained of all its energy although, cleansed from all impurities. And thus, they all fell asleep on the spot, with both Heron and Morpheus bringing them back to the cave one by one.
But because of the ongoing fight, they were immediately woken up. The rumbling created by the training grounds extended on the whole of the cave. They all heard it, shaking so violently that they couldn't; possibly be put at ease especially because, one earth, rumbling earth meant earthquakes. And humans aren't that fond of natural disasters and calamities such as these.
