It's important to remember that stage combat is just that,
stage combat. Things work because the fight director says they do, not because they have any counterpart in real swordsmanship.
The reason for this is simple. The goal in stage combat is to NOT hit your opponent, which is obviously diametrically opposed to the goal of real swordsmanship. This is so actors, who are obviously not swordsmen, stay safe.
The goal of real swordsmanship is to kill your opponent in the fastest, safest, most efficient way possible. This usually means putting the point in the opponent's face whenever possible to draw a flinch response if your thrust misses. The point in the face is the tactics that much of the German school of swordsmanship focuses on (the windings, etc), and in the Book of Five Rings, Musashi also advocates keeping the point threatening the opponent's face. In a real fight, that's a good thing. In stage combat, this activity will (not surprisingly) get someone stabbed in the face. Of course, enough of this results in Hollywood running out of actors, or at the very least, having lots of actors wearing eyepatches.
So, Real Swordmanship = killing. Stage Combat = telling a story while keeping the actors safe.
While some stage combat directors will, when it's convenient apply some real technique to a scene, most of them don't care about real technique at all. Most stage combat stuff is suicidal from a combat standpoint.
You've never seen stuff like this in the movies:
http://www.youtube.com/watch?v=nmoSedeqrHo&feature=channel_page
http://www.youtube.com/watch?v=38sVdx7nzhQ&feature=channel_page
Here's an example of the "point in the face" stuff, done slowly so you can see it:
http://www.youtube.com/watch?v=6ainzFa7mHc&feature=channel_page
Note how fast the encounter ends. A sword fight takes a few seconds and someone's dead.
That's what swordsmanship ACTUALLY looks like.
Best regards,
-Mark