"My understanding of magic is quite limited. Is there such a thing as a self-targeting spell that you could cast at the enemy that would find the highest-ranking opponent and blind just that one sentient? Or does magic normally work on the line-of-sight principle?"

Nothing was quite so intimidating as a missile whispering by overhead, and knowing that the optical scanner in its nose was primed for a certain target. Couldn't the same be true of magic?