Minor Lee Sin Baron bug

Sorry I have no video link of this(here's the link: http://youtu.be/KbybeBj2K-4). I found a bug on Lee Sin where if you Q the Baron, but while the Q is in air you walk out of range, then second of the second part of Q going off, it immediately goes on cooldown. Essentially what you do to create the bug is be just within the range of the Q, throw the Q out, walk out of the Q range while the Q is flying towards baron, then you won't be able to have the option to walk and activate the second part of Q. Sorry if this post is not properly formatted... first time posting on the forums. Thanks!

EDIT: Here's a normal Lee Sin Q interaction: http://youtu.be/dFsFzSjVm-U)