Disconcerting acts or words

[don't move]

This happened in the finals of the 4A state championship several years ago. 4th and 2 for A who has decided to go for it. Just before the snap, ALL of Bs defensive line 'flopped' down to the ground, flat on their stomaches, without breaking the plane. At least 3 A linemen jumped. After a long discussion, A was called for a false start. Our state commissioner, who is also on the NF rules committee, said, and I agree, that this was a disconcerting act, which was intended to interfere with the movement of A. This should have been a foul on B.
As a referee, I would be peeved if the coach didn't tell me about that play in the pre-game, because it certainly had to have been rehersed.