When the nerf happened is when I was leveling my shaman in HS. After a while if you are fighting the same mobs you get to know what level the mob is and at what % of health they are at when you need to re-click epic, or re-root them. Just takes time if you are at the same camp for a long while to dial it in.
If you switch camps, all that info you've gathered will go out the window. Also if you go somewhere where the mobs are a static level, you will get it down pretty quick. Like if you went to PoM rat maze, you will know what level each rat is before hand and what % of health they are at when your epic dot wears off. Pretty quick to dial it in there
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