[bigjohn]

SITUATION 9:
On fourth and one from B's 21-yard line, all A players are set, as defensive end B1 is in a two-point stance across from offensive tackle A5 along their respective lines of scrimmage. While the quarterback is calling signals, B1 (a) claps his hands, (b) stomps his foot, or (c) shifts to a wider position on the line and immediately returns to his original position.
RULING: In (a) and (b), if in the official's judgment the action by B1 was for the purpose of disconcerting or hindering A, it is an unsportsmanlike conduct foul. In this case, the official should sound his whistle before the snap. In (c), the movement is legal. (9-5-1d)


This is from the 2007 NFHS Rules Interpretations Powerpoint
This is still a valid interpretation isn't it?

Why would an official judge that the defender was doing anything other than trying to make A false start in a or b? I have asked officials why they won't call this and they say, hey man that is just football!