Sierra grinned evilly as a few pixies hovered, completely frozen, just before her. Mwah haha! Take that, you evil creatures! There were many, many more where those came from, though. Pixies were still coming in left and right, and all Sierra could do was keep turning around and around to face more and more of them.

"IMMOBULUS!" she yelled out, freezing a few more pixies. She was barely putting a dent in them. There were just so many! Where in the name of Merlin were they coming from?! "IMMOBULUS!" she yelled again. At least the others were following along. It made a lot more sense to have everybody herd the pixies in and then attack just as they were attacking the students.

Merlin help her. She was learning to work with others. O_o