"Uh... no?" Yuya just looks straight confused about that. A crystal? Why would it be a crystal?

He holds the radio up once he's by Cole, pointing at the dials on the device. "It's technology. And I guess magic too, but I don't really know how that part works. This is the volume, and this lets you change the channel."

He points to the respective toggles as he speaks. The carnival is falling apart, but he's teaching this new guy how to use the radio. It's probably the most useful thing Yuya's capable of right now.