Even though Charlie hadn't spoken, she was willing to bet that the ideas she'd had floating around her head were up there in the way over the top, last case scenario "Ravenclaw" thoughts. Proving that she was more of a Ravenclaw that she knew, or at least admitted to herself.

Arresto Momentum. Raising her hand timidly into the air, Charlie offered an answer. "I think -" you know, don't quote her on it "- that the charm was invented due to a Quidditch annoyance? Wasn't it first used to slower Quaffles down, in order that Chasers could retrieve it more easily?"

Not that she really had much of a clue when it came to Quidditch, however. Or whether that was relative to the lesson. "It was also used during Harry Potters third year, when the Dementors approached the Quidditch Pitch, by Professor Dumbledore."