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My source of this information is through gameplay. I just tested this again, just to make sure I was right. Pulled 10 Hozen in Jade Forest. After about 4 of them died blade flurry started hitting the corpses. You can tell not only from the lack of damage numbers appearing, but also you can see the blade flurry hit animation ON the bodies. Its like a slight red flash.
I know what I am talking about, and have posted this in bug reports with no answer or fix. Maybe if more rogues notice this (finally) and mention it to blizzard, something will finally be done about it.