On the off-chance you have not seen this 20-lateral play by Trinity, here it is:
In American Football, the other ten players without the ball are taught to go downfield and throw a block. However, if everyone does this, then a play like this becomes impossible, because no one is behind the ball carrier to receive a lateral. I played rugby for years, and the training there is different. You want to get behind the ball carrier diagonally to be ready to receive the ball. This is what you see here -- watch for it. Players are backpedaling to get in position. I don't know if any of these players had rugby training -- I do know that a number of the Cal players in "the play" were also rugby players.