Ein and Molotov both pause to watch Spike, and they look at each other when the door closes again. This, of course, can only mean one thing.

They need to investigate.

Being a helpful dog and all, Ein takes Molotov to the bathroom door, where she disembarks to peer through the keyhole into the darkness of the bathroom. She can't see anything, so she sits cross-legged on the floor next to Ein while she thinks. Thinks and realizes that the crack under the door might be big enough for her to wriggle through.

And that is why Spike is being approached at frightening speeds by a sparkly ball of light.