Compare the pool banks
of the last page and this one. See how the red arrow indicating the final aim point has moved to the right to adjust for the target ball moving closer to the rail?
Recall we are considering the object ball at its position as our Origin Point and its intended pocket as our Destination Point and building our semi-square from there.
There is deliberate word selection with our "OP" and "DP" as you'll learn in the next illustration.