Fast travel + random encounters

[0Bahamut]

So there's a mod adding random encounters to the game now, but it's still working strangely. So I'm asking this : does anyone know how exactly does the fast travel system work? Is there a script, a variable, or even some command used only by the game to move the player between locations? I've been searching a bit, and there's really nothing on the net that says how it's done