The professor's quite admonition about being late had Lydia flushing but no one seemed to either notice or care. She actually cared about this class, it was probably her favorite (tied with Care of Magical Creatures of course) so to get called out was quite embarrassing. That's what she got for trying to get extra credit in another class.

And then her attempt at the charm failed. Not even a droplet of water came from her wand. Even more embarrassing, though it didn't seem that others were having much luck either. Picking up her wand from where she'd dejectedly dropped it on the table in front of her, Lydia glanced sideways at Somersby and then up at the professor. "Aquamenti!" Hopefully that would work.