13%? You probably misunderstood. 67% of the time, the attacker will have a focus available to spend - that is the assumption. 13% would be way too low. That would be like only getting your action 1 out of 4 times, and then spending your focus on defense before you attack half of the time.
You typed "ficus" instead of "focus", and he made a joke.
Ha ha, I am slow. And smart phone fail. Well done sir, well done. :-)