Derry was observing. She liked that it wasn't too hectic in here. From her spot on the sofa she could just about see everything that was going on in the room, and that made her happy for some reason. It was like a live action book.

And then THERE WAS THE TROPHY!!! Derry BEAMED at it, all happy and proud and excited and giddy and probably in the best mood she had been all year. They had won every game. Derry hadnt even been on a team for anything before and yet she had finally found something that she could do with other people. Siiiigh. Fantastic.

In fact she was so giddy that she hardly even heard professor Lafay, which wasnt surprising, since Derry hardly paid attention to her surroundings unless she was bored. But she noticed the sudden coldness, and the rattle and the... well... she was suddenly angry. WHY WERE THEY NOT ALLOWED TO CELEBRATE?!

"For gods sake let us enjoy our victory!" She pointed her wand at the dementors and tried to recreate the happiness she had been feeling just a moment ago. "Expecto patronum!"

...

The general idea was for that to be some sort of heroic save of the day before the sadness set it. But since Derry had never quite managed a corporeal patronus, all she managed was a mist... granted, it was considerably thicker than when she had started practicing, and she saw the hint of a feather, but it wasn't a patronus. And now she looked like an idiot. Fantastic. UGH. Well, she's managed to irritate the dementors now, probably... So she backed away..

ADULTS. DO SOMETHING.