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How it's done!
1. Get a druid friend to duel you.
2. Once duel begins, Have your druid friend cast Nature's Swiftness.
3. Use Spellsteal.
4. You will gain Nature's swiftness.
The bug in this is that the Nature's Swiftness does not get removed when you cast a spell. So you can literally spam Frostbolt as much as you wish, Granted you have the Mana.