Shades of Bargast INSANE DPS!?!?

[Guesswork]

So after killing heroic Huntsman last night, I noticed I was atop the dps chart by a pretty wide margin... Further investigation revealed that my void elf racial passive - entropic embrace was doing massive damage to the shades of Bargast. I'm assuming it's a bug? The racial is just supposed to proc for 5% damage in the form of shadowfrost damage. Also, the shades take more damage the longer they are CC'd but that shouldn't single me out since many dps were nuking them down. Unless I get more dps buff for being the one CCing? But that would mean whoever CC'd the other shade would also do huge damage... Idk

Curious if anyone else has witnessed this or has any thoughts as to why. If it's simply a bug then I guess enjoy it while it lasts.