[GAMEPLAY] Invisible sonic wave onto Bard when Lee Sin is in a brush [VIDEO]

Bug occurred May 17th 2015, OCE server, normal game, patch 5.9.15_05_11_02_41.

I have not attempted to recreate this bug.

During a recent normal game I was supporting Kalista as Bard against another Kalista and a Lee Sin. The bug occurred when Lee Sin used sonic wave from inside the bottom brush. The skillshot was invisible until it hit me and I was 'marked'.

A short video of the bug is included. It occurs at ~0:43. Apologies to anyone who is offended by my use of "what the f**k". I wanted to include the audio in case it can be useful for determining the cause of the bug.

Here's the link the game in my match history: http://matchhistory.oce.leagueoflegends.com/en/#match-details/OC1/90053481/200154619?tab=overview