RG Live WotLK 3.3.5a

Soll:

Es sollte nur der erste Angriff verfehlen:
(Patch 3.3.2)

Confirmed, Works on all bosses in ICC 10.
A perfectly timed Dust Cloud on Festergut is absolutely delicious.
As per the comments above, it does not react with spells.
It causes all enemies within 10 yards to miss their next attack. (Melee)
You can view the debuff on the boss it'll be one of the first because its you putting the debuff on.
It goes off fast because it was used by the mob as it goes to hit the tank, as designed.

Es sollten nur Meleehits betroffen sein:
(Patch 3.1.3)

I was just testing this on the vrykul just south of the argent tournament, since they spam shadow bolt, and it seems that it does not affect spells [...]

Ist:
Es werden alle Meleehits in der Zeit des Debuffs verfehlt
Es sind nur Meleehits betroffen