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If you aggro a Deadwind Widow and move it near the cliffs at the north end of Deadwind Pass, it will follow you around and evade damage.

Props to Bjorno43 from the forums OwnedCore for posting about it: http://www.ownedcore.com/forums/world-of-warcraft/world-of-warcraft-exploits/345488-deadwind-widdow-bug-still-working.html