The light of the lumos charms disappeared as people began duelling in earnest, and they were left in the dark, only the spells they shot lighting the room, like a Muggle strobe light, only multi-coloured. It almost looked pretty Hermione thought absently, as she ducked a hex and sent back a stupefy with a flick of her wand. Everything seemed to be going very slowly, except for her heart, which raced in her chest, whirring and thudding, faster and faster until she thought she was going to explode. At least the Caterwauling Charm had stopped its incessant, deafening wails, and the only sounds were yells and screams, and shouted spells and the crack of the spells themselves.