Mana Drain Aura WHY ALWAYS HASTED!?!?!?!?!?!?!? LITERALLY WTF

These rare enemies are designed on purpose to be un-fun. 100% of the time the Mana Drain aura rares are the fastest mob in existence. I went out of my way to counter it, i made my sorc as fast as i could, and still even with temporal chains the monster is still fast enough to run me down??? DUMB by design.
I could understand if only occasionally, the aura happened to be on a really fast monster, but EVERY time is a little ridiculous. I don't even want to play my sorc anymore it's so dumb-- not to mention I'm not having a blast with the infusions system either. throw on top of that the absolute rage-bait Mana Drain aura that, by design, cannot be countered, and i don't even want to play. THAT IS SIMPLY UNFUN.
People in the end of the day want to have fun, and it would have been a blast to rise up against the challenge and i tried, but god damn, the monster is up my ass no matter what i do, i have no mana, and that's uncool.
If there is a counterplay that i'm missing please enlighten me into how i can fit my character into the very specific box you would like for me to play in.

Not sure if you accounted for this but the mana drain only works if you are actually in the thing blue ring. At melee distance, it won't drain your mana. I will usually roll around the rare, staying inside of the mana drain circle and slowly kill him. But I understand the frustration. This doesn't always work and sometimes, the rare mob is way to dangerous to be close to but maybe this helps.

I actually did not know the center was safe. It sure is annoying trying to run, because they are all so fast.