Quote:
Originally Posted by Robert Goodman
Because officials are also required to determine whether B is trying to confuse A by imitating their signals. But because there's no rule reserving certain words to either team, you don't know whether when B1 calls "shift" he's trying to get team A to shift, or when he calls "go" he's trying to get them to snap the ball, or whether he's just giving a signal to team B.
Robert
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And it's not always easy to determine who said "shift" or "go". Unless you are watching the QB's mouth (which nobody should be doing), you can't tell if it's coming from him or one of the defenders.