Brisingr gets caught by one of those - not burned and not seeming particularly injured, but it disrupts her flight.
It turns out there's enough loose rubble on this mountainside to be thrown by the wind! For now it's mostly smaller chunks, not finely controlled, but a lot of dust's getting kicked up, and visibility's getting bad.
Brisingr also is incredibly fast for her size - she seems to have a specific snatch of song she uses to zoom in a straight line, but even when not zooming she's fairly swift. Still, dodging the blasts of fire and then just the ones with rock (as she gets a sense for the difference) slows her down.
Ellisaria might notice that Brisingr is usually keeping her belly turned away from the other dragon, arcing so her side and spine are most commonly presented as she manipulates the air.