"What if the dragons attack directly from above?" Tyrion broke the silence. "The scorpions can only shoot in one direction, and while there might be hundreds of them at different angles, they would struggle to move, secure, and aim them in parallel with the walls to point towards the sky. If you start from the main keep, which is the tallest, you can work your way downwards and set all the scorpions on fire, and not a single one would be able to take a shot at the dragons."