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If you look at the inside xbox video you can see a guy called rezerruction03 has a red name but if you look at the other team mates Nikolai was in blue and takeo has a red name but the guy in green which is Richtofen wasn't present so maybe this is what treyarch was talking about QED curse because if you look at the video a player with a red name gets killed and it creates a similar explosion like the QED. So my guess is it replicates explosions and gun shots but it will also put a curse on the player that used it so as a result a clone will attack the team hence it being the curse that treyarch was talking about.