Shaiya gold players can do this by starting to push the spell.
If you are high on defense, players usually drag a bunch of mobs, uses Fire Bush and while kiting, casts spells with low casting times. If mobs are close to you, and they attack all at once, you can cast every spell with cast time not longer than 1sec without interruption. Shaiya gold players can do this by starting to push the spell at the moment the mobs attack you. To make all mobs attack at once, after gathering them, move a bit so that they have to go after you. That should work.Pretty advanced style of play, we would say, to self-tank with a mage. You must kite the mobs. Fire Thorns will aid as small, but free damage. Other than that, all you should do is use AoE wind magic, while outside the range of mobs, far enough for Storm to end being casted. Don't use fire, as it's far more risky, although used well, Fire Bush helps a lot.