Immune to knockback? Wow. Hardcore.

If that is the case then as a warrior prior to 80 when the health/healing/armor/stuff is readjusted i would be looking for boxers to blow my bladestorm on. It is a whirlwind every second for six seconds and so it hits four (or five?) targets, so you want to find a nice group all nestled together.

Ellay... what do you do at the moment for the bladestorming warriors? Just /clap?

Maybe use a spread out formation so they can't hit them all? In BS they can still move but they would have to move around and not hit everyone if the spread out was far enough.