Mikkish was about to rejoice that he had been set free of his ice problem when he noticed pieces of the truck hurling towards him.  He was about to speed dash out of the way when suddenly, the pieces dropped, remains of the ice melted then vanished, and the students all adapted confused looks on their faces, as their magic suddenly wasn't working. Mikkish figured what was going on when he discovered that as he was trying to speed dash, all he was capable of was a quick, but not at all supernatural, short sprint. 

"Alright alright, THATS IT!" Yelled an elderly, but fit man who walked into the courtyard "No more. I know you're mostly all probably new, but magic does NOT make life a video game. Now get back to your dorms! I am leaving the device on all night now, and don't think you'll find it!"

The device he referenced was what caused the sudden inability to use magic.  The effect field was large enough to cover the entire courtyard as well as much of the main school building and dorm building. Bummer.