Can someone else confirm?

Just played a game as Nocturne and for some reason when I used his E (the skill that attaches links to enemy champ/monster and fears them) I was not able to Auto attack that monster/minion/champ. Is this a stealth nerf? Glitch? Or did I just get really unlucky in my game and my Nocturne decided to say "forget it i'll wait till E is done binding to resume auto attacking."