[ If the Doctor had noticed the distance Zhou Zishu was putting between him and the small little fire he doesn't acknowledge it. But then again, the likelihood of him noticing is slim considering how hard he's concentrating on trying to find the right setting. ]

There's some sort of interference in this world. I suspect that was why the technology here was malfunctioning when we arrived.

[ There's a moment where the whirring sounds more like creaking gears and then finally a spark ignites and a triumphant smile stretches onto his features. ]

And then there was light! Or fire. You get the idea.