when you apply two enchants of http://www.db.pandawow.me?item=98163 on your weapons and hit some mob or dummy for test, the enchant have a proc but proccing after another, not together like how the must be.. still need adjusting
edit:
this is an image from retail, he have 2xhttp://www.db.pandawow.me?item=98163
http://store.picbg.net/thumb/DE/85/899163aa8774de85.jpg
again edit:
i found few mop videos and as you can see in this picture this guy have 2x enchants but they not proccing together
http://store.picbg.net/thumb/F4/19/786b867c542af419.png
p.s. i'm just confused... i think we need experienced rogue player from retail who played during the mists of pandaria expansion and to share his comment for this enchant