Watch New Zealand. When they get the opportunity they just go up a gear from their normal defensive or possession speed to a more intense one, so the opposition really struggle to play against them. Northampton are a little like that, yet all they do is move the ball to the outside. You do not have to create many complicated angles nor move people around too much. If you are playing at an amazing pace, you can run very fast, very straight and either go for it yourself until you are stopped or pass the ball to the guy on your outside.