get me out of this mess

[Texas Aggie]

You might just say, "don't reach through" and hope that 1) they are listening and 2) know what you are talking about. But it isn't your job to educate them. Preventative officiating only requires simple instructions. If it gets to the point of you having to get out a chalk board, it then ceases to be your duty to prevent it (assuming you had a duty all along).