Here's a good clip from John Clements focusing on an often forgotten aspect of swordfighting; the dynamic gripping of swords. Some time ago I wrote an article about this and although I find it lacking today, I still think it has some good images, even if I really should add more to them.
This topic is important for our understanding of the historical fencing, I believe, and I suggest you take a look at both the clip, the article and the images. However, keep in mind that both the clip and my old article brings together a lot of unrelated sources that sometimes have little to do with each other, which can create an impression of more widespread and common use than what was the practical reality. This is an unintentional sideeffect of trying to put the light on the mechanism which was in fact used by many masters, especially those in a line that seems to be related to the Marxbrüder, as seen in the article about Meyer's Masters.
Here are also some really good Hammaborg clips exploring this from Codex Wallerstein and Peter Falkner. Falkner was of course a Marxbrüder Captain. Also, Jörg Wilhalm shows this, for instance with the Brechfenster, again seen in the Meyer's Masters article.
Here are the images that I used in my old article, where I briefly discussed this topic.
More reading: How do you grip a sword?