Two chasers work in tandem to maintain a middle force on the primary handlers. Chasers mark the thrower and force side dump tightly so that there is no easy reset. Red 3 protects the inside lane and the up the line cut from Blue-1. Red-4 covers the crashers. Red-5 protects the open side. Red 6 and 7 split the deep space.
As the disc moves, the cup and the wall move as a unit. If the disc gets to blue-3, Red-2 becomes the mark and forces to the center. Red-5 now covers the inside lane and Red-3 covers the open side. Red-1 shifts to the other side of Blue-2.
If disc shifts back to center, Red-2 becomes the mark. Red-1 covers Blue-1 and the wall shifts over. Red-5 now has to worry about both the inside lane and the up the line cut from Blue-3.