Don't forget the guillotine once NF Criteria has been reached offensive wrestler can lock hands without an arm, cost us back pts last yr at districts and just because the bottom wrestlers starts squealling when the arm is being raised to go over offensive wrestlers head does NOT mean it is PD. Cost BP at State and a loss. Ref's get down there and make sure the arm goes the correct direction instead of standing up and blowing your whistle signaling Potentially Dangerous
I think what gets missed a whole lot more is a legal move that ends up being illegal when the leg slips out or into a scissors and the wrestler does not release the headlock. Or, when the defensive wrestler gets out of criteria briefly and the lock is not broken. You have to have a grapevined leg and be in criteria to lock on the head without an arm encircled above the elbow ...failing to have either one makes it an illegal headlock. And even if it is legal, it can be PD if the shoulder is being torqued to the limit of its normal range of motion...and it is important to be in position so you don't take away an advantage fairly earned while protecting the safety of the wrestlers.
And here's a controversial proposition...I believe the official needs to make sure the offensive wrestler knows the situation so he can lock and unlock legally. It's easy going into it because you verbalize the NF "One, two" so he knows he can lock. But if the defensive wrestler comes out of criteria, and unless its obvious, I believe the official needs to warn the offensive wrestler to release the lock...the reason? It is the official who decides whether criteria is met or not. It is not up to the wrestler to decide. Criteria can be a matter of a few degrees or an inch or so, in the official's determination. And in this situation, it is often hard for the wrestler to see the defensive man's shoulder area as well, making it even more important for the official to verbalize if the NF criteria changes.
(This was actually a topic in the NFHS Officals' Quarterly a while back and that's the conclusion reached there as well, just in case anybody might think this preventing officiating technique is coaching).