Here is a short, rough-cut bit of "trailer" footage of Salahuddin Muhammad (Hontai Hakkei Ryu Aikijujutsu) demonstrating some knife techniques from his art, for a new DVD he is producing. These are not the formal kata of HHR, but free-form applications that are based on the principles and concepts.
I thought it would be interesting for people to view how internal principles translate to bladed-weapon work. HHR-AJJ is a weapons-based art derived directly from koryu, but most of what is available on public-access video shows taijutsu applications.
Although the movements shown can be done with conventional jujutsu-style leverage and vectors, they are more powerful, controlling and effective when driven by internal body method (aiki), as is the case in this video.