Good question, I don't think I have even seen this happen. Are you talking about the center call out out coverages or actually calling the play and snap count? I looked in the book and under 7-1-5,6&7 it covers encroachment and the rule states that defensive players an not be in the NZ calling signals after the ball is marked ready. What you are describing is not specifically cover however could fall under any act clearly intended to cause B to encroach.
I think the puropse of the center calling the signals would be to cause encroachment and should be flagged. Hard to say with out seeing it!
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