Thanks for trying, but as we all know, "You can lead a horse to water, then it's up to the horse.". It could be helpful to have "rule support", for what ultimately boils down to common sense and practical, but sometimes you just have to do what's right, and makes sense, whether you have support, or not.
This question is a lot less about following a set protocol, or violating some imaginary universal precedent, as it it is about safely concluding a particular, spirited, perhaps even emotionally charged, physical contest between groups of teenage student athletes, who at times are prone to risk exposing themselves to potentially serious, unanticipated consequences by not thinking through their thoughts before acting on them.
Choosing to avoid taking prudent cautions, even unauthorized ones, AT TIMES, can produce far more serious risk, than allowing situations to unfold without reasonable warnings.