As all we know mage is range attacker, so mostly will keep a distance from us but sometime he charged forward to us.
From my experience, most likely he want to put curse on us.
So we should just move backward a bit to keep the distance, after 2-3 secs its ok to melee attack the mage especially dagger rogues, warrior.

Any one can confirm about this behavior ? Or sharing other mage's behaviour and what do you do against that.