Breathe Again
Elphaba had done something to the people in the class, alright. Everyone was frozen, save for her and Fiyero.
Those frozen would barely be considered living- they couldn't breathe, blink, or move at all; only their heartbeats continued.
Elphaba had gotten upset over someone bullying a Cat, and had yelled for everyone to "just stop".
She realized what had happened and ran out, flustered. Fiyero followed her, both unaware that as she had left, everyone's ability to move had been restored.
Glinda inhaled sweet oxygen; thanks to Elphaba's goodness, she could breathe again.