Graves Smokescreen Blocks Tower Shots (exploitable)

I wasn't able to get a shot of it happening but the information is up there at least.

The Graves was named DerCranky, and there was a point in the game when a tower shot was about to kill him, he dashed out of the towers range, the shot followed him and right before it was going to connect, he put a smoke screen on himself and the shot disappeared. It never dealt damage, he never died. He just stood in the middle of the screen and danced like he knew he was safe.

Game was on EUW at about 17:30. Match Details here: http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/2533954540/35201202/eog