Originally Posted by The Narrator

As you concentrate on your classwork, it isn’t likely you will hear the magic building up within the air of the classroom.

There is nothing to worry about here. Not a thing. Not until your hand moves around your wand handle at least. What will happen then, I wonder?

For some of you, your magic will backfire, causing an explosion as your own spells fail you.

If your wand doesn't backfire, your wand simply won’t answer your call to siphon your magic, causing your magic to completely fail you.