[GAMEPLAY] champs escaping Urgot's Ult for no reason

Some how during a ranked game as Urgot , Champs (mainly Lucian ) walk out of my ult and basically cancelled it with out swaping. there was no sign of being stunned or hard cc and my bubble stayed on us both and he got away. No one had or or even a that might have stopped it. I wished I had recorded this match to show this in action but the screen shot my friend took while spectating should help. http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2209584673/48317837?tab=overview http://magnet-toa.tumblr.com/image/145571756010