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Q u o t e:
I just got done dueling a resto shaman. I got stuck with a frost shock just as I hit bladestorm.

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This probably falls under the realm of things that are not bugs. Specifically things that happen at the exact same instant.

Brief explanation from the bug forums:

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Q u o t e:
8. “Impossible” simultaneous actions.
Examples: Rogue Vanish being broken by attacks, Two mages polymorphing each other, Paladin Divine Shield being dispelled as it is cast.
Because of the Client-Server nature of the game it is possible for two mutually exclusive actions to occur at the same time resulting in some unexpected behavior. Although efforts are made to minimize these situations they will still happen on occasion.

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