Being able to spam heals and nukes is awesome and useful, and there's lots of scenarios where it's game changing, like:
-- Casting Jboots or invis on the run
-- Fast canni for shaman
-- Insta charm break for charming classes with insta-invis items
-- Agro reset for Necros and SKs with FD and pre-nerf circlet
-- Quick junk buffs for fights where you're getting dispelled
Also, even clickies that have a casting time reset the timer when they're done. For example, with a shaman you can canni immediately after the 8 second cast of the JBB and then click the JBB with no delay, sneaking in a canni between casts. So even long cast clickies let you do voodoo with the timer. Potions work the same way.
My necro doesn't have Jboots but I'm guessing you could click them on the run and then click the circlet really fast and basically be able to cast your run speed buff on the run without dropping your invis? Either way, casting on the run is awesome.
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