[Puck doesn't have to be told twice. As the magic finishes collecting, Puck sends it out. The light is gone as quickly as it arrived, and the two of them are invisible. There's no kind of "tell" that they're still in the area. No heat waves, no signs that the air is moving around their forms. It's as if they've vanished. But they can still see each other and speak at a normal volume, as Puck demonstrates.]

There you are, one invisibility spell. [Puck even makes a show of dusting his hands off with a grin.] We can still move, and everything else, we just won't be seen while doing it.