Ok, instead of suggesting they nerf ground of strength into the ground, i think they should be bringing the other mage souls up on par with it, my suggestion would be to allow a mage to cast spells while moving with ride the wind active as long as they have a tier 5 chain talent(you would need 25 points into the soul to get this ability so its not a pickup skill), this will allow the stormcaller to feel like a true kiting class, while it wouldn't give the cc immunity that grounding of strength has, it will give the class a way of keeping a warrior at the 20-30m range mark that can be crossed in less the 2 second icicle cast.