Dragons comprised entirely of green and gold sparks were soaring up and down the corridors, emitting loud fiery blasts and bangs as they went; shocking-pink Catherine wheels five feet in diameter were whizzing lethally through the air like so many flying saucers; rockets with long tails of brilliant silver stars were ricocheting off the walls; sparklers were writing swear words in midair of their own accord; firecrackers were exploding like mines everywhere Hermione looked, and instead of burning themselves out, fading from sight or fizzling to a halt, these pyrotechnical miracles seemed to be gaining in energy and momentum the longer he watched.