Game Mechanics: Shaman Riposte - Not supposed to happen

[RiffDaemon]

Ok, I was fighting a death beetle in Unrest just a minute ago, and my 15 Shaman just performed a miraculous feat: He riposted. However, Shamans don't get Riposte. I searched the forums as best I could using the Search and Google, and I can't find anything about this happening to anyone.

I don't know what can be done about it, but I figured this should be known.

Thanks.

Edit: Originally did an attachment, but it was hard to see. Here's a photobucket link that's a little better:

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