This video is about Schaedelhau (skull-strike), which is a basic Oberhau (high strike), a strike made vertically from high to low at the vertex of the foes head.
The Basic Strikes may be made from arbitrary angles. For training we only use eight (8) specific angles, which protects the fencer like an hexagonal star. The movement of a given strike may be easy to understand, but it takes perpetual training to perform that strike really well.
to watch this video and see this technique explained in detail