Blizzard 2 is a Point Blank AE that is mostly for soft crowd control as it's damage is almost non-existant but it has a bind component. In a game where crowd control is virtually never used, you're probably better off just using Blizzard 1 until mana recovers enough to go back into casting Fire 2. Using Blizzard 2 is a surefire way to spot somebody is new to the class and game because most BLM's just stop using it after a couple dungeons.