Ok, so I've searched this site for some while now and I couldn't find anything about this. It's possible that there might be something like it but not in Azjol Nerub.
Anyway, you need a Death Knight and a some partymembers.
When you have done the second boss in Azjol Nerub there is a road leading you further down in the instance. If you follow that road you will come to a big hole in the ground that you need to jump down in. Right before you and your partymembers jump down there, use the spell "Path of Frost" ([Only registered and activated users can see links. ]). Remove your own buff in the air and you will survive, but your friends will hit the water as if it would have been normal ground!
Have Fun.
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And they die on the water surface? This works in almost every instance, since most of them use pits of water as the quick way out.
Utgarde keep for example.
I know that, but I thought I'd post for Azjol as this jump is much higher than in the other instances and when you finish an instance someone might use hearthstone instead of taking the pits of water as you said.
[Death Knight] Kill your friends in Azjol Nerub 
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