Inaccurately Accurate

[Terminal Devastation]

but when you conjure up fire out of nowhere...

I originally wanted to suggest a few ways this does in fact make sense, but then I realised the implications of my theory, and think it would be really neat to explore the concept more accurately as a game mechanic.

When fire comes up out of nowwhere, you're using pure visual distance to judge where the fire should just appear. Still have to aim it in a sense, so a mage might misjudge the distance and direction from time to time....

And then I had the idea of magic becoming more likely to hit the more its used in a fight, sort of like a bizzare game of battleship, where your vision is the same as if you were really drunk, and your opponent is showing his board as well.
You can see the target, but can't quite grasp exactly where it is.