Kalinda growled when her Guitar was snatched from her. When the girl sat down, Kalinda slipped into the shadows. She might not be speedy, or leave a frigging rainbow behind in her wake, but the shadows were her world. 

Shadows were everywhere. You couldn't have light without shadows. And this girl just happened to leave light in her wake. So, Kalinda would be able to follow her quite easily. Shadows were smooth, fluid, and went where the light was, unless she manipulated them. Right now though, all she did was move through them in seconds, and reappear in front of the girl. 

"Do not touch my guitar again" she said softly. She decided not to give the girl a chance to try and torment her again, slipping into the shadows once more.