"Some witches did escape," said Camio. "Did you never wonder why "Floo powder’ was invented? Jumping into fires isn’t an intuitive method of travel, and a dangerous thing to experiment with. It was a desperate plan, for desperate times. Not all witches and wizards could Apparate, especially the young. So one bright Swedish alchemist – one of our allies, not Flamel of course – invented a powder to help their people escape. You kept a pouch of Flöja Powder in your pocket, so when it was dropped in the flames, or failing that when the flames reached you and started burning your clothes, it’d turn the fire green and you could travel instantaneously to a safe house, such as Hogwarts, where a fire was kept constantly burning in the Great Hall to aid travel. Let’s say you managed that."