Kayn ult bug

Pretty large bug I noticed a game ago. A Kayn was chasing me through the jungle, and right before I got into the base, Kayn, as a last-ditch effort to kill me, ulted. "ha, what an idiot" I thought to myself as a I walked through the base gate. Only I didn't. and this wasn't like it was solid terrain, my champ was trying to move through it but was getting pushed back. It was the weirdest thing ever. And it was definitely his ult because right after it ended I made it through. He had to chase me a bit in base to kill me, and if it wasn't for this bug I probably would have lived.