Change
Glinda cradled the hat, all she had left of her friend.
"Your whole life is going to change, and all because of me!"
Glinda wondered how much of this was her fault, how much she could have prevented. What if she'd accepted Elphaba's offer to defy gravity? What if she'd done something in the years since to try to clear her name? What if she hadn't let Elphaba go behind that curtain alone?
Elphaba had told her she'd made a difference, but how much more could she have changed if she'd actually done something, rather than stand aside and watch?