Heimerdinger Ult Turret (Gamplay)

Mode: ARAM Character: Cho'Gath

I was up against a Space Invader Heimerdinger (or whatever that skin is), and he put down his ult turret. I flashed away from it and kept walking, but it kept attacking me, damaging me as normal. The turret was by the inhibitor, and I made it to my fountain before it killed me. We had definitely lost the game by then, but this seems potentially gamebreaking.