Rengar gaining Bonetooth stacks from assists.

So I decided to play a few Rengar matches yesterday, but since I'm a tank main I did terribly in all of them. However, I noticed, repeatedly that despite having anywhere from 0 to 1 kills, the portraits representing who I needed to kill had gone grey, and I had the stacks. Because I had assisted in killing them. This is a pretty major bug considering how much AD he gets out of those stacks, so I think it warrants a look fairly soon.