Elemental Maelstrom Mage DOT

[Bulzie]

Says does 250 then another 350 in dots. It costs about same mana as the 44 DD shock of swords and does same dmg of 600 total. So question is what is a good use for it? mabe cast it as your pet engages and you won't get aggro from mob since dot slower dmg on mob? Is this a mob pull spell?