I've got video of me doing that kind of blocking, but YouTube is blocked here at work. Search YouTube for "AAF Norman Knight Fight" and you should find it, or get the MPG at
http://www.aaf.org.au/gallery/videos/displays/bergmann-anglican-school/MOV05211.MPG (21.1Mb download...). The bit I'm thinking of occurs at about the 29 second mark. Mike makes a fast attack to my head and I whirl my sword to deflect it without conscious thought. In fact, you can see my
conscious thought, as I duck my head slightly, knowing for a fact that I'm about to be hit.

Yes, I'm the one that's humiliated at the end...