Very cool, Lilo! Daenarys' dragons are back and incinerating people and goats, while Westeros are still saying stuff like "oh wells, they're tiny".
Oceans are wide and mail is slow, nobody has seen a live dragon for over a century and a healthy on for a century and a half, they dont know how fast they grow.
Its a theoretical threat they havent grasped the enormity of yet!