Materia Caves glitch

This glitch is of when you are collecting the infamous summon of Final Fantasy VII, The Knights of the Round. When the player first walks into the cave, they can either walk in front of the Materia Crystal, or behind it. If the player walks behind the crystal, and decides to get the Summon Materia, there is a very small chance that after you get the Materia, another speech message will appear, saying the same thing as before, and then it says that you get another KotR Materia. The player would normally get overwhelmed by the fact that they got another Materia without mastering the original. Then, when they exit out of the speech square, they find out that they are now immobile. This is a different type of the "Black World map" glitch, that also makes the player immobile, except the difference is that you must be flying the Airship. This is a valid reason for the player to save whenever possible, so that they don't have to backtrack as much.