Couldn't the WA just re-target and pot, what's the difference? I'm not sure about you but I rebound my keys to things I can hit easily. For example if I were to play a WA I might set the spacebar to target myself so I can quickly tap it with my thumb while I 1-2-3-4-5-6 a combo while potting with my pinky as needed. Hand never leaves the keyboard and it can all be done without delay.
It's actually similar with the WI because when a WI runs out of MP during BM2 the BM2 animation stops completely (really bad for your DPS since it stops everything for a good 3 seconds) so it's necessary to manually regen your mana before it hits empty. Same concept yeah? Hit a key while in the process of BM2'ing.
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