Diana blinks at him, a little surprised. She assumed Walter would already know the ones she came across. She frowns as she tries to remember. "Something rock... S... S... Solar rock? Solrock! That was it."

Isla trots back to her trainer, coiling one ribbon around her arm and another patting her knee. She chirps when Diana pets her head, sparing Walter and Claudia the briefest look.

"There was stuff about it being from the sun and using it to get energy." She couldn't remember the exact details.