itch.io

i uploaded a new version of the book where this is futher explained, you should be able to download again. There is more content now too, like enemy examples and trap and ambush mechanics.

I think you are talking about the "actions" in the chapter "run and gun" right? It's an example of using the sorroundings described bybthe referee as advantage. If the referee for example describes a scenery where there's ruins around the combat zone, you can try to make some decaying ruins fall onto your enemy, that's using the ambient to fight for you.