(no subject)

 Most young wizards aren't able to master more difficult charms like the Patronus. That's why this particular part of Defense Against the Dark Arts is optional, or at the very least not penalized. But Rachel is a Slytherin, and like all Slytherins she's ambitious, and it's more likely than not when she's an Auror she'll need to be able to conjure a Patronus, so she figured she may as well start early.

"Expecto Patronum!"

She's getting on better than most, at least. Others aren't even able to get the smoke-like wisps that she's managed to conjure up so far.