Hi Aberdeen, Glasgow here and we'd like to inform you that you're having it easy. We have to deal with an exhibitionist, serial molester ghost in a leotard. Send us all your changelings so we can use them to get rid of our menace.

Plot twist: The warning was about humans all along. I would certainly warn everybody about us but the vague transmission is vague. It could be someone on a different planet warning that their family went for holidays on Earth and they might love nicking hotel soaps.