Amy? Susan? Jack? Anyone?

I'm reading DL Walters' book on retriever handling and am to the Walking
Baseball drill.

I can sort of do it step by step and can see that it is a very helpful
drill, but only if I exactly follow the diagrams.

For some reason, I am having trouble generalizing the game into something I
can do without a photocopy of the diagram in my hand.

Can someone who is familiar with the drill try explaining it in their own
words instead of Walters, so I can see another point of view on the drill?

Kate
--
and Storm, who's doing lots of pattern blinds and lining drills