Another Warwick Bug!!!
I found that sometimes when i try to ult an enemy, but they are behind a thick wall (cuz diagonally facing them) my ult would hit the wall and STOP, even tho my ult circle is radius is WELL BEYOND the other side of the wall.
This happened to me few times. When i was in base, the tomb stopped me (which is a pretty small obsticle...) when i started ulting standing right next to it. And in another game in bot lane, the wall at the bottom right of the tribush stopped my ult, and another game at the wall beside blue team's second mid tower in lane.
In all of these cases, my ult range circle was obviously FAR greater than the thickness of the wall.