Lex noted the use of the 'Sup' in response to her own and stored it for later reference. Professors that weren't sticks in the mud went high on her list simply for the fact that they didn't let every little thing bother them. Merlin, imagine her slipping and saying 'sup' to Bellaire. The subsequent point loss would scar her for sure. Not a nice thought so she'd get back to the circular motions for the broom. It was important to get every inch shining like she didn't know what.

Alexa had gotten through shining it up nice and impressive like and was ready to start on the other before moving over to deal with the twig end but then she heard the Professor saying something about no magic....ooops?

The next broom couldn't have a quick scourgify done on it then but look at all this dust!! You couldn't just polish a dusty broom--or well you could in theory but it wouldn't much be the same now would it? The shine would be different and that was a lazy man's way of work. If she wasn't gonna do something then it was worth doing right the first time.

So putting the kneazle to work again. She shrugged a shoulder to get his attention. "Get me another cloth from the box over there, will you?" One to get the dust off first. It would drive her mad if she let it stay. In the mean time she went back to the first broom, giving it a few more rubs for good measure.