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Broadcast Angles: Replay is wholly dependent on video angles shown by broadcast networks. They control not only which angles are shown, but they also control when they are shown, whether they are shown in full speed or slow motion, and the beginning and end of the action shown. Prior to a coach’s challenge, the replay official and individuals in the coaches’ both receive the same feed from the network. Additionally, the number of video angles will vary during each of the game windows due to the number of cameras used by the network.
I assume this applies to all replay and this may be a hidden issue too. I was under the impression that replay officials got to see all angels available but this makes it sound like what angles and at what speeds the officials view the replay are entirely up to the video network covering the game. So there is going to be both a lack of consistency in available camera angles from game to game based on how a network broadcast's its game AND depending on who is determining what to pass along to the replay officials the network could inadvertently be providing biased video angles to the review team to begin with.