I'm seeing some people having major trouble with the Kat mobs in T3. Indeed they are way more tricky than T2 ones.
There are many ways to deal with them. Those who uses the calibur line can try this:
http://www.youtube.com/watch?v=eGtO12GbvpQ
http://www.youtube.com/watch?v=ZAP0_ucIXHc
the key is to release the charged attack the moment they blink. the distance matters, too close its not gonna work, too far might not arrive you yet. so give it a try and get used to a mid-range that you can adapt to.
----- Rits
Dude... that was awesome. Releasing on blink is a great tip.