Let me try again, there are only 3 signals; Fair Catch, Invalid Fair Catch and Illegal Fair Catch (which applies only to the runner). There is no such thing as a "get away signal" under the NF code.
If a player invents some sort of signal to warn his teammates to stay away from the ball, unless it meets the requirements of a Fair Catch signal, or in the judgment of the covering official could be interpreted as an invalid FC signal, it's nothing.
Now what kind of hand or arm movement might be interpreted as a possible invalid FC signal may vary between officials. As always rational, sound judgment is the deciding factor.
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