Kayle Bug that Instantly Cleanses Nautilus Auto Attack Snare

At 5:20 in the replay, you can see that even though I auto attacked Kayle (this was the 2nd time all game i have been able to auto attac kher up to this point. the last, and first, time I autod her was about 1: 55), she did not get rooted. This bug may have lost me the kill and the opportunity to get my lane back in my control.