She'll refrain from doing it again. Unless he starts to get relentlessly unpleasant before she's taught him how to fly properly, in which case, all bets are off.

"I know," she says with a wry smile. "It takes some getting used to. It looked good, though - your wing opened properly." Maybe he'll try it again without her prompting him. Otherwise, if she gave the stick a little jiggle, he'd probably open his wings instinctively.