Zac E will shoot you off in random directions because of this interaction.
RIght now Zac's E spell will aim always towards your cursor except for when you hover over the minimap and the champion portraits of your team.
I consider myself a Zac main, he's the champion I have most mastery on, my go to jungler and the champion that helped me finish plat 3 last season (And I still was slowly rising). There has never been a time where I hovered over the minimap or my allies portraits to aim my E, but there have been many times in game this "feature" has completely screwed my E over (dare I say at least once per game).
I move my screen using my cursor and I have the champion portraits to the left of the screen, if I happen to want to move the screen and cast E in a short amount of time it is very likely I'm going to end up facing a completely random direction (Since when I'm moving the screen I very likely will hover over the minimap or allied portraits).
This interaction makes no sense, a lot of players haven't even made the connection that it is what is causing them to face random directions when slingshotting and consequently consider it a bug. Might we please remove it?