Magic. Shireen's heart began to beat faster. He was speaking of magic, and it was said that the greyscale originated from the curse of a Rhoynar Prince. Stannis Baratheon's promises of rich rewards had attracted even Warlocks from Qarth, but their skills were dubious at least... Jon Stark however was said to have resurrected himself from his funeral pyre, unburnt by the flames and with dragons in his arms. The wildlings even called him a skinchanger. Him being capable of magic...would explain a lot of things. But Melisandre could do magic too, and the Red Priestess was...terrifying.