талант "Заморозка мозгов", читаем описание спелла - после произнесения любого заклинания магии льда, наносящего урон и накладывающего эффект окоченение (Your Frost damage spells with chilling effects have a 15% chance to cause your next Fireball or Frostfire Bolt spell to be instant cast and cost no mana.)
талант "Зимняя стужа" (Increases your chance to critically hit with Frostbolt by an additional 3% and gives your Frost damage spells a 100% chance to apply the Winter's Chill effect, which increases the chance spells will critically hit the target by 1% for 15 sec. Stacks up to 5 times.)
смотрим сюда: http://wowwiki.wikia.../Winter's_Chill
1) "maxing out the talent means that every frost spell you cast will apply this debuff."
2) "On the other hand Winter's Chill can be applied by any frost damage spell, including [Blizzard] and [Frostfire Bolt],.."
3) "However, Winter's Chill is refreshed by any Frost spell from a mage with the Winter's Chill talent"
4) "Also note that any damaging frost spell will attempt to apply the debuff, including Frost Nova."
Что сделать: убрать ограничение на срабатывание от стрела ледяного огня, снежная буря и кольцо льда