Is There a Necessity of Creating a Perpendicularity?

Bobadin can't create a perpendicularity that will just go from any place to any other place. Like you can still only travel in a straight line through the realms. I think that's like sticking a pencil through three paper. She started with her army is here and therefore she's limited on the time and the space where she can be. It's unclear exactly what their function is in the creation of the perpendicularity. We have this quote from the mayor, quote, the location, he said, turning back.