[GAMEPLAY] Gragas Q outside of Howling Abyss

When playing Gragas in Howling Abyss you can cast your Q outside the walls (the side walls). This has occurred around 3 out of 3 times for me in ARAM mode.

1. Take your mouse outside of one wall.
2. Cast your Q and see the magic happen.
3. You have successfully cast your Q outside the wall... This happens to me all the time and is very annoying because you can miss your Q's and so on.

sorry for my bad English.