[GAMEPLAY] Map vision in river

It seems that, as where they stand, Twisted Fate can't see Zac, but Zac does see him.

Check the minimaps (my monitor can't capture entire both screens but minimap would do, I'll try to find a way to show both entire screens at once, if possible)

Steps to reproduce the error? Just position both opposite champions in the same points shown within the screenshot

Zac's POV (left) | Twisted Fate's POV (right)

http://i.imgur.com/esbItML.jpg

P.s.: I used a virtual machine to open a second client and verify that.