Not sure if this is a bug or not, but I was playing Draven on Twisted Treeline last game and I was solo top against a Darius who got FB so it would be kinda tough.. Ultimately I lost my lane and Darius just became fed and unstoppable throughout the game (Not saying he's OP, he just dominated the match) because of this: About 5 minutes in during the laning phase I was pushed back to my tower and saw Darius walk into the bush in the middle of the lane at the last second, so I knew he was in there, but I threw the Double Axes in there just to make sure. I didn't hear anything or see any effects, so I figured he either recalled or flashed over the wall to gank my teammates in bot lane. So I start walking into the bush and call "Mia" in the process, and when I get there, I found Darius right there in the same spot that I threw my axes! Of course, he killed me because there was nothing I could do at that point. We were pretty evenly matched throughout the game before this happened, if I would not have died there I could've won.
Like I said before, I'm not sure if this is a bug or not, so please correct me if I'm wrong. I'm pretty sure you can hear the impact of most skillshots hitting someone in bushes, such as Ezreal's Q, and I did not see or hear any effect when I shot Darius with my Double Axes, so I figured he wasn't there. Darius even admitted that I hit him, after the game was over.
EDIT: Riot, can you please respond?