Just a note on the use of Full Defense, which is found under the base uses of the Guard skill. It allows you to expend a normal action to do nothing but defend, forfeiting your ability to make attacks. This also includes counterattacks, ripostes and other attacks that are launched from a defensive position.
So if you have an ability to attack when you parry, counter when you dodge, parry or block and other sorts of counters, you lose them when you are in Full Defense mode. I wasn't this explicit in the book since I thought it clear but since its come up a time or two in games let me state that point.