[ Karen looks surprised, like she wasn't expecting this, but as you sing the Amethyst key starts to glow.

As the song goes on, the glow brightens, until it's almost impossible to see anything but the brightness.

When the song finishes, the glow lessens and dims until the key is just the key again, still glowing, but so faintly as to be nearly imperceptible in the light of the hallway. ]