Xin Zhao Critical Glitch

I was playing Xin in an Aram and every third hit my critical rate increased to 100% even though I had no critical items of any kind. I don't believe that it operated that way the whole match but I'm not exactly certain. I didn't notice it until part of the way through.

If I had to guess, I would say that it started after I picked up Duskblade but I'm not sure. It took me a bit to notice, but I think it was tuned to the attack which recovers Xin's life.