An Adult Blue Dragon has the following action
Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 20 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
If a creature that is within 5 feet of the Dragon makes the Dex saving throw, and the dragon moves, does that provoke an opportunity Attack on the dragon?
In my head if a character is busy trying not to get knocked prone, then they wouldn't have time to get a quick attack in.
However, the action doesn't specifically state that it prevents attacks of opportunity.