Lingering Warwick ult bug.
This bug has been prevalent, but tolerable in the past what occurs is Warwick ults you say you are riven or shaco. You can cancel his ult yourself via 3rd q or ultimate in shaco's case. Though his ult has been stopped and he can walk away freely the damage from his ult still persists. This is strange because if any other teammate stops WW's ult the damage is also stopped. Here are a few videos of the bug. With WW becoming such a large pick nowadays in season 5 preseason I believe this ult should be properly addressed.