While playing the "Final Four" cross-game playlist in the Master Chief Collection, the game wouldn't end after Halo 2 and after the final cutscene, it was stuck on a black screen for a little bit. When I switched to classic mode, a really creepy and messed up looking Cortana appeared on screen. Not sure what caused this, but i couldn't continue with the playlist anymore and had to end it completely.
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The Creepy Cortana is a glitch that only occurs in the Halo: The Master Chief Collection version...