Gameplay: Camille ult + poro bug

I was playing as Ahri in legend of the poro king and camille used her ult on me. About a second later i poro-ed camille and immediately went to her with the poro. Upon arrival instead of everything working I became nearly invisible to myself (like a Rengar ult) and untargetable for about three seconds, only the ball was clearly visible, though this may be because my passive was up and it was glowing green. This effect lasted after the camille ult finished but after those three seconds, everything went back to normal. It did not effect gameplay further, but did keep camille from killing me. I have not tried to reproduce this.