Loop casting is used to cast the same spell (more or less) repeatedly. We've only seen Tatsuya use it at x3, so unless we see it go beyond x10, it may still subject to the 10x limit.
I wasn't going to watch the material that explained magic, but now I might since the technicalities still seem to be blurry.
Flying won't make hitting airborne balls easier? That must be a typo right?And flying so won't make hitting balls of light easier if everyone else have to jump.