Where do I said Laguna created the Pandora?
The Pandora was created before the Centra Lunar cry by the Centra soldiers under Adelīs orders.

To Crazybayman:

Unlike field events there werenīt bugs on FMVīs.

Do you know,a FMV is something easy to program.Itīs just a film.There were no "if" commands nor things like that which can complicate the program making it difficult for the programmers (even the best ones) to detect some errors.A FMV is a straight movie.
And they created the magic on the floor to show the users that the shaft will pass through the floor as a ghost.So itīs not that they "forgot" about the debris.
Also,a FMV needs to be realistic.Itīs not like the world map which isnīt at scale nor the field.