Its not a bug, its a
feature
But yea it gets annoying. They can pull it off even when you haven't been detected
This. It gets annoying fast.
I did have some fun with it once while playing one of my mages. Had finally unlocked Lightening Storm for her, and was on my way to find a dragon to test it out on, when I stumbled upon some roaming bandits in the wild. Fus Ro Dah'd them then mopped up the low level mooks before taking on the Bandit Chiefs.
With one chief down I lobbed a fireball at the second who was charging me with his two-handed iron sword of "lol", when he did that Neo level dodge. Was understandably miffed about that, so I used Become Etheral right quick, charged up Lightening Storm and at point blank range, I channeled my inner Trinity and muttered to my TV "Dodge this".
A fine pile of dust, he made.