"It's simple. I use the core to activate an electrical pulse in the middle, and I activate a different mode to shut it off. That's going to be one of the trickier parts on the larger-scale version, but working with things the size of the head of a pin isn't easy either."

He accepted his tea with a thoughtful look. "But you control the power of fire?"

It seemed they were both more interested in asking questions. Hmm.