How did SafeSurf speak through Caspian?

I'm a fan of the theory that Maddie was not in a SafeSurf simulation. There's just too little evidence for it. I believe that SafeSurf knew how long it's going to take her to produce a Caspian, and therefore came to her from the Galaxy center to extend the invite.

But then I'm wondering, if Maddie is not in SafeSurf's simulation, how did SafeSurf speak through Caspian, to give her the "clue"?..

Any thoughts guys?