"Demon attack..."
―Felix telling Andy what has happened

The "Magic allergy" is a mysterious illness that befalls all of the mothers of the Nowhere Boys in the Alternate World, whenever the boys came in contact with them.


Andy Lau's theory on this is because they were "allergic" to the boys, since they weren't supposed to be there, which is surprising because Andy's first assumption was that the sausages were making them sick, until Felix decided out that it might be a Demon attack.