That’s when she heard it. Her ears perked up and she looked up, rubbing her eyes with a fetlock. “Do… do you guys hear that?” she asked. It started out slow, barely perceptible, before gaining in volume.  A strange, deeply uncomfortable sound could be heard all around them. One that only seemed to increase in intensity as it grew louder. Yelps and shouts came from her right as a bunch of foals leapt from where they had been sitting, a plume of grey smoke erupting from the ground where they had been standing.