Duskblade of Draktharr bug

just noticed in my first game of the day that there is a bug associated with Duskblade of Draktharr and Zed, now i know that its suppose to be your basic attacks basically becoming a zed ult in the sense, but i just noticed that there is a double zed prock when he uses his ult with a duskblade and this defintily needs to be fixed, and how i noticed it was that he was able to kill anyone with under 2000 health and under 100 armor, with only his ult prock and no autos