We used to purge, and I believe it's been agreed the majority of times even in arena we don't waste time on purge anymore. There is too much dmg vs. survivability nowadays and purging is precious seconds lost where you should have just dps'd.
I just stagger the whole "totem set" (call of elements or w/e), therefore the tremor is auto staggered, and you don't have to wait the 1 second GCD between clicks, just tap the sequence 4 times quick and voila, done in like 1 second.
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