No, Evocation’s effect is to increase mana regen from spirit, NOT to fill your mana bar. The end result of that regen boost is that you have a full (or fuller) mana bar. The spirit boost ends when the Evocation ends.
Blizzards effect is to damage baddies that are inside the circle (and other stuff depending on talents). So when it ends so does the damage.
/thread
edit: sorry if i have repeated someone else from the thread. I couldn’t sit and read through 200+ replies to this lunacy.