Stollas, Blitzø, Luna, Moxxie and Millie are all in the human world because they are stuck and can’t get back to hell. The 5 of them are in a school vent hiding from humans because they are demons. They saw security and police running around and a girl standing at the base of the vent

Blitzø: “move Moxxie, I don’t have room”

Stollas: “Blitzy quiet so no one hears us-“

they then saw highly armed policemen