Quote Originally Posted by Valmonte View Post
It tells you when to cast that AoE when the unwanted mobs are out of the circle.
If you consider that telling you when to do something then take this example:

Casting blizzara - 200 mp, 10 second cooldown.

Your mp is telling you how many/how many more blizzaras you can cast now
Your cooldown timer is telling you when to cast it again