I'm assuming this is just a bug with replays (I was on the other team so can't say 100% for sure).
If you look at the replay labeled in the client as "PBE1-33875200", at 22:41 something happened to Xed.. I'm not entirely certain what.. but after that point in time he had a shadow that appears to grant vision stuck near the middle of the bridge. It lasted the rest of the game.
[Champions & Gameplay Feedback](http://boards.pbe.leagueoflegends.com/en/c/champions-gameplay-feedback)
[Client & New Features Feedback](http://boards.pbe.leagueoflegends.com/en/c/client-new-features-feedback)
[General PBE Feedback](http://boards.pbe.leagueoflegends.com/en/c/general-pbe-feedback)
Post your PBE bug reports here. Need help? Read our [bug reporting guide](http://community.pbe.leagueoflegends.com/c/bugs/CF5EEDC8FF5AC1A896F517E2C7AE4650C472807F-how-to-report-bugs-on-the-pbe).
If you experience a bug related to the PBE Community site, report it on the [Site Feedback subcommunity](http://community.pbe.leagueoflegends.com/c/site-feedback).