Sett ultimate bug

So tested the new champion Sett, and this happend, I would like also to be known I did not abuse this bug and it just happend when I r sorry for the crap video btw.

-Edit my record timing was poor, I just grabbed blitz with my r and died, but he was stuck on me from that time and on and couldn't unstuck in any way until the game finished (the video starts by showing the enemy Sett for no reason)