Here is what just happened to me. I charge a sorc casting at a buddy and stop it, but that sorcs buddies start running at me so I hit the mist form and start moving away. Immediately after, I get this knock back animation, knocked back in their direction, not the direction I was moving. I CC break and hit the mist form again and once again, even while in CC immunity, I get the same knock back animation immediately after activating mist form then killed.
This isn't even the only time this has happened, and its getting frustrating. It already cancels any heal I had on me to activate, then it just stops because of whatever someone does that isn't supposed to work on me anyways.