I just asked this question to my WH yesterday on the way to a game, I'm usually the HL and asked him about IG. He basicly said that he is the one that throws the flag, but he needs the linemen to let him know if no receivers were in the area. His reason was that he needs to keep an eye on the QB to make sure there's no roughing, so it's hard for him to watch downfield. If there are no receivers, then we let him know and he throws the flag then.
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