"That is a fair conclusion based solely upon the assumption that Zoom does not have the potential to take one where they have not been before. If Erdrick's lantern can exist outside of the world, watching us, who is to say we could not also travel to such a distance?"

Truly it is just a matter of application of sufficient magical force. Which Jasper, not Hendrik, was the master of. For he had not been deemed worthy of knightly tutelage.