Game Play Going inside Baron

I have found a bug on and and possibly other characters. So what has happened is when I used alpha strike or lunge on Baron, I temporarily go into baron and get pushed out slowly. When you're getting pushed out you champion acts as if stunned. To re-create this you start Baron and then have Master Yi or Fiora use their q on baron. This has happened to me quite often and I don't think many people have found this bug.