Legal Blocking Technique? (NFHS)

[l3will]

Old three man mechanics would normally use a Referee, Linesman and an Umpire which might help catch this.

My thought would be to show this to the opposing team's coach and point out to him that this is an illegal technique. That is very clear in the third play that is shown. I'd also show this to your league officials with the recommendation that all coaches be made aware that this is an illegal blocking technique and also made aware of the safety aspect.

That's where I think I would start.