Dragon's Wing Buffet is a bit complicated, so I'll explain it here: Everyone within 10 feet (at the time, that's Loklafd, Lorenn, Sesto, and Kalorn) of the dragon takes damage and are knocked prone if they fail a dc19 Dexterity Save. No damage, not prone if you make the save. Either way, the dragon flies up to its speed. When the dragon flies away provoking opportunity attacks from Sesto & Kalorn (with disadvantage if they're prone). He will provoke from Lorenn too, if Lorenn makes the save, but if Lorenn is knocked prone, he falls off his board, falling 20 feet down and out of his ability to reach the dragon. Lolkafd is too far away for an opportunity attack, as he's 10 feet away at the time.
The heavy obscurement from the Lair, I'm going to say, is blown away by the force of the dragon's beating wings, so he can be seen during this, in the light of Sesto's shield.
