I don't want my kids developing bad habits from doing things the wrong way because they have a bag to land in either. Again I think this would be awesome and being that we mainly ride Midwest 500' vert being the norm, it would be an experience and create a lot of memories !!!!
BUT DAMN that just looks fun as hell
There are few things in life without consequences or just minimal consequences...this looks to be one of those learning opportunities for your sons. Huck away, Huck away all.