[GAMEPLAY] Lee sin Q into W bug.+

Hello Riot! I've been experiencing a bug with lee sin twice now I believe. The bug goes works like this

1. Lee sin q's and then q's once again
2. While flying you press w to of course cancel the q and fly back.
3. The w goes on cooldown and yet Lee sin keeps flying.

It's really gamebreaking for me as you could see in the clip it easily could've killed me and besides that it's an important mechanic to bait out abilities and so on.

http://plays.tv/video/5815b015b1231014e0/rioterino?from=user