I didn't see turns, looked like they drifted to me. Hard to say either way since the camera is not fixed. The verbal description given during their running commentary sounded like a lantern as well.
We used to make homemade "sky lanterns" (as we called them) back in t he 70s using dry cleaning bags, soda straws, and birthday candles. If you could get one of the blue tinted dry cleaning bags, it tended to give a sharper, more defined light/image. At least one of our lanterns was reported as a UFO, I've still got the newspaper article somewhere in a scrapbook.