Haven't contributed much recently, found this one out yesterday and figured I'd share it.
It's common knowledge that you can blink/demonic portal the val'kyr's grip on Lich King, but there are two exploits for warriors, wherein if you intervene at the exact second they get gripped, neither you or them get gripped and the val'kyr simply flies away with nobody there. Also, if you use Bladestorm or Killing Spree, you will continue to do damage while gripped, and the range seems to be 2-3x the normal range, although your normal white melees, which usually continue to happen, don't.
I'll try to post screenshots next LK kill, it's pretty hard to do obviously.
The only feasible use I can think of is either having all your warriors intervene different people, or get ridiculously lucky. (Offtank got gripped at the time, i was just dicking around when I discovered it).
Hope this helps someone.
P.S. I've heard you can iceblock/bubble/HoP it as well, can anyone confirm?