yep i was really surprised when i somehow got rage from charging a raidboss midfight for mobility reason, i thaught it was a bug, but someone here in this forum told me it was supported. But in many fights i personally want the carge / leap for other reasons that just ragegain, so its another micromanagment level when it is right to charge for additional rage while not compromising your mobility stuff.
In hfc i often charged some add that would spawn if possible for rage (and for killing it) and now u get even more range for charging back to the boss, or u save your charge for the next add, its cool decicsion making and a small little learn to optimize the encounter stuff, i like it
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about dc hs fr macro: i dont really get it whats so complicated or apm heavy about it. u just macro hamstring into your deadly calm button, and spam it for its duration, while keep smashing the fr botton (which is on the mouse for me)?