Handler-marks forcing middle into the rover (3). The deep on the opposite side of the handler with the disc stays furthest deep (5), 4 plays more shallow.
If the disc gets dumped, the two deeps switch.
If a cutter hits the break-side under, the shallow deep (5) comes and covers it, while the other deep (4) comes across to the middle.
If the cutter goes to the open-side, 4 comes under with 5 dropping back.