And of course having 3 in the tackle makes it harder or perhaps impossible to decide who is at fault - it just becomes a mass of arms, legs and bodies, with the weight of the 3 coming down on top of the one. The prime purpose of this is to slow down the play, as it takes three tangled bodies longer to get up off the tackled player. When this weight is combined with the momentum of the ball carrier, gravity and the angle of bodies, there is a significant amount of force driving the tackled player into the ground. Combine this with wrestling and other martial arts holds you've got a problem in the making. It's a game of Russian roulette and eventually it will result in a player being seriously injured, as has happened to this young man.