Last thing on this quest I swear. xD
I finished it right now and I had to move to the top-left corner to talk with the Narrator. I've checked his initdlg.bcs script, and it has a See([PC]) trigger in the block conditions so he won't start the dialogue without seeing one of the characters. I've checked if some mods modify the script, but only Rogue Rebalancing adds two blocks on top to handle pick pockets attempts. I don't think RR changes the last block too.
I'd suggest either to spawn the narrator near the main character, or change the script and make the main character "speak" with himself, using a script defined dialogue, thus not needing the narrator anymore.
Fixed.