Look the goodyear blimp.

I remember a tale as I heard out of Germany. Thus it was, the master and usher of a school had upon occasion oppointed the field, and their weapon was each of them a two handed sword, and meeting at the place appointed, said the master that you are not so good as your word. The usher asked him why; marry said he, thou promised to bring no body with thee. And yet look behind you...."

And then the Master smote off his head.

This is one of Swetnam's lessons. Now it is different for us because doing something like this is dangerous, so has no place in sparring or competition. It just opens the door to some serious harm- especially if the back of their mask is not closed.

But it does apply in some ways. You can use body language to suggest you're unready. The Lazy guard with added slouching is a good way to feign that kind of idea, allowing you to break their attack with a bit of surprise. The golden rule is, if you're in wide measure (or thereabouts) then frame a guard, if your opponent appears unprepared, he's probably lying. And don't let yourself get distracted.

I mentioned something like this quite a while ago- when we were first practising in the park. It is very easy to be distracted by pretty, scantily clad women, and that is a guaranteed hit for your opponent.