Dear Crossface, NFHS rule 5-28-2 specifically outlines a situation where a wrestler repeatedly drops to one KNEE to break lock hands as Unsportsmanlike Conduct and is to be penalized as such. The rule book does not however out line touching the mat as a way to break locked hands, however if in the opinion of the referee a contestant is "slapping" the mat to gain a locked hands call, the referee is not required to award a lock hands call. This is where it becomes tricky though. In order for the referee to not award the lock hands call he has to make the determination that the wrestler who is being controlled (the bottom guy) is not using his hands to support his weight. If this is the case then it would be locked hand. However if all he is doing is briefly slapping the mat in an effort to break the hands, then it will be a judgement call as to whether the official wants to award or not. Remembering the the object of the lock hands call is to keep a wrestler in control from gaining an extra advantage. If I were the official out on that mat and this happened I would recognize the fact that the wrestler was just trying to get this call awarded to him/her, and if they were not supporting weight on their hands I would not call it.