[GAMEPLAY] Tristana's W (jump) was canceled by a Nunu's AA

Note: I DID NOT DIE FROM THE AutoAttack.

Note: I was NOT using Smartcast

I was playing a bot match and nobody was around except a Nunu and my teamate standing in the brush. I was about to die, so I decided to W (rocket jump) away. Nunu auto-attacked me just as I was jumping away (he autoattacked within half a second of my jumping animation) and it completely stopped it. About six seconds went by of me running away until Nunu's snowball was back up after using it on my teamate and THEN I died. I could clearly see where I was supposed to land, but I got not even remotely close to that.