Okay, just to clear up the confusions: "Wtf, completely fake!": No, this was a bug exploit in the game and the footage in this video IS real.
"The situation is entirely fake, custom game and fake reactions". No, yes, it was a custom game, we made a game called 'Catch The Teemo'. Unmercey and I went on different sides (while on Skype) and the social engineering happened (Unmercey telling his team to go to red and me telling my team to go to their blue and not move from the bush). The reactions are 100% real, even Unmercey and I were shocked that such a devastating thing could happen. Then we left like 5 mins after.