The Frozen Lord Glitch has happened in my playthrough. I had no idea that this existed. I guess I will have to restart the chapter...
Oh well, such is life. I just wanted to upload this image that I find really funny. You can see that half of Seliph's sprite is inside the map and the other half cannot be seen on the screen. I cannot even select him since he is not in a map tile. This happened because I saved during the chapter and then got back, hoping that it would be fixed. The cursor does not reset to Seliph at the start of each Player Phase when this glitch happens, it instead appears at the top-left corner of the map. Turns out the game really thinks he is there.