One thing to consider is that prior to every game the officials meet with the head coach during their warm ups. They ask if there is anything they should keep an eye on. That is time to explain things you have seen an opponent do on film that you think might be an issue. The officials will also ask the head coach if he has any trick plays he plans on running. At that time, the coach describes the play in detail, and the officials will let him know whether it is a legal play or not. So the description of the play passed muster. A coach might even let the side judge on his side know that it is coming. The message can be relayed to the white hat and the rest of the crew. That crew deemed it to be a legal play. Not saying one way or the other if the ruling was right, but I do think it is important to add details that had not been mentioned yet.