It means for some fuckin' stupid reason, some worlds are able to sustain magic and others aren't.

[It at least is getting the boar to back up a bit. Dirk moves in closer to Edward, so he can have the other dude's back if it comes to it. He knows the routes out, so...]

We can try to get out if we head [nod of his head] that way. There's a mansion we can get into. It'll probably leave off once we're far enough out of its territory anyway.