Leo would like to keep arguing about why telling Mikey about any alleged ghost encounters is absolutely not a thing Donnie should do, but then Donnie is inviting the ghosts downstairs.

It's

probably fine!

For the shadows' part, they stop their dancing for a few moments to all look at Donnie in unison. Then they spin around a couple times, still synchronized, before one by one they start to file down the stairs, bringing their ghost lights with them.

"Well, no turning back now," says Leo. "Let's go!"