Well, pretty sure they didn't know what was in it :/
They read an online article about how the book was good for kids so idk.
"I scanned the street again. I saw nothing amiss, but I didn’t doubt Meg had seen shiny blobs. Many spirits could appear that way. My own father, Zeus, once took the form of a shiny blob to woo a mortal woman. (Why the mortal woman found that attractive, I have no idea."
this, right? it's not very explicit.