Before begining a*n overhead strike the charicters place their blade in a high Vom Tag gaurd, described as such in Pseudo-Peter von Danzig:
Mark, the guard is called From the Day, therein position yourself thus: stand with your left foot before and hold your sword on your right shoulder, or with up-stretched arms high over your head, and stand thus in the guard.
This description is also accompanied by the following illustration:
Given the given description this vertical gaurd would seem to be angled between 45 degrees back and perfectly vertical when done properly. My own personal experience with fencing would back up this theory as any further back and gravity starts to work against you, making strikes slower and more demanding than they ought to. In game this is taken to an utterly absurd extreme with the sword being either perfectly level with the ground or even pointed slightly towards it. Given that making the sword more vertical would actually serve to make the guard more prominent I think the game would only be improved by a more historically probable sword usage.
Edit: Reexamined the games combat and realized that the guard I was bothered by isn’t the ‘poised overhead’ animation but instead the ‘ready for overhead attack’ animation. I don’t have an issue with it in principle (telegraphing like that is a common error among amateur and even some intermediate fencers) but it looks comical when they start holding it for extended periods. Nothing could really be done to fix this so I think my previous criticisms can be safely disregarded.