I took an ECQC course from "southnarc" (Craig Douglas - ShivWorks) years back. The Friday night block was "In Extremis Knife". A guy brought a "street sword" with him - the looks were priceless. He even published a book about using one - https://www.amazon.com/Street-Sword-Practical-Blade-Self-Defense/dp/1581605986 - I'll leave members here to judge what it is worth. He even has a website, which is recommended for comic relief.
Craig, on the other hand, is not to be fucked with.
Craig, on the other hand, is not to be fucked with.