Well, I see where you're coming from in that, but this spell is actually more of a way for me to track hunts. I'm basically just another site bounty-hunter, so... yeah. I'm trying to out-hunt Hunter -- that was my original idea with this. But if they used an invisibility spell or something of the like, it would not truly hide them from their own aura, but I can modify it just a bit to make things fair, so give me a second and I will edit this post when done.
-=EDIT=-
There. Is that a bit better?