The Slytherin's spell hit its target with no problem this time. Really, as Andromeda had heard she'd been the one to successfully become an Animagus, it was about time. There was an atmospheric crackle as Mademoiselle Rookwood turned to stone almost immediately.

The matron nodded at the Slytherin, "This round to you, Mademoiselle Whitledge," she said, casting the counter-charm. "Mademoiselle Rookwood, if you would please begin our tie-breaker."