The Doctor puts the candy floss in the hand holding the now melted shake, and his other hand goes to his chin in thought. And the staves do seem useful and he likes stumbling upon useful items like these during his travels. "I'm guessing magelight is something akin to a torch." The name is obvious enough, but The Doctor needs to be sure he doesn't end up blowing a hole in the universe or Nexus.

"And if it is, it sounds like something that can be of use for me in my travels."