Step 1

Here blue4 is set up in a good position to take away the under-open cutting space available to red4

Step 2

But if the disc moves to the centre of the field, the 'under-open' space for the thrower has moved, and blue4 is slightly out of position

Step 3

Without any adjustment from blue4, red4 will have easy access to the inside line

Step 4

But if in the same set-up, blue4 adjusts (or orbits) to take more of an inside line...

Step 5

...then they can block this option

Step 6

If we now look at the same set-up positioning, but with the disc swung to the far side of the field. We can see red4 has easy access to an open-under throw from red3

Step 7

In this situation blue4 would need to orbit all the way round to the 'breakside' of red4...

Step 8

...to cover the open-under throw from red3

Step 9