Remember that blocking is a powerful mechanic, and in PvP is extremely prevalent. Aside from severely diminishing your raw pressure, it makes you much less of a threat, forces you to change targets when training, and spiking is pretty much out of the question unless you're really, really, really desperate for a kill (which you probably shouldn't be).
Besides, there's something more wrong than your elite choice if you choose to train a target with Mystic Regen on.
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