第十八章：很短的一章，看起来在五分钟内一切都很顺利(4)

As they slipped out of the witch’s harbour, flocks of dragons and seagulls flew screeching overhead, screaming cries of warning, swarming in numbers like a plague of locusts from the direction of the Open Sea. 
An extraordinary noise followed them, a noise unlike anything Hiccup had ever heard before, a deep and elemental howl. For one second, Hiccup thought it was the Dragon Furious, before realising that no living creature could make that noise – not even a mighty Sea Dragon the size of a mountain.