Even if Kat wasn't exactly talking and stuff, the prefect was still paying attention to the discussion. She could definitely OBVIOUSLY tell that Professor Knox was, uhm, strict. Cleaning charms, yes. Something useful even if it did require more effort and cleaning. Merlin they had to know that Kat hated cleaning, but she'd do it anyway so that Hogwarts would be cleaner and better. SIGHS. Katrina Hudson did NOT want to live in dirt forever.

Activity. Okay, finally she can participate.

"Scourgify!" she casted on her desk and it became clean. Now, she was expected to polish it. 'Kay then. Kat practiced the incantation a few times. "Poliotus... Poliotus... Poh-Lee-OH-Tuss..." She pronunciated-ish it even.

And the big S wand movement. Not a problem. "Poliotus!" Kat said while drawing a big S over her desk. Tada! Polished and clean. She had done her job, and she was done practicing.