Some strange person wrote this. It seems they haven't played the third game and don't know that Lightning and Arrow are two completely different spells. At least because they belong to different schools of magic. They also don't know that in the third game, there are various creatures with immunity to different schools of magic. At least that should be a distinguishing factor. Otherwise, I could also say that, for example, Magic Fist and Ice Bolt have the same effect, only visually different.