I think what you were seeing was the most basic position of the guard its like the starting point. it is like a high guard but with a more controlled lockdown of your opponent this is good to avoid being ground and pounded.from there it goes into some unique submisions but the triangle choke seems to be the quickest to land. the book also diagrams alot of situations and moves that are similar or the same as BBJ like escapes and half guard sweeps so the book is a good buy to have good pictured diagrams as a refrence