Col. Nattapong Buayam, a former Thai spec-ops hand-to-hand and weapons instructor, trained elite troops in Southeast Asia on the combative essence of krabi krabong (Thai traditional weaponry) and muay Boran (the forefather to muay Thai) for decades. The aggressive footwork and rapid-fire weapon attacks make it a nightmare to defend against. Black Belt contributing editor Dr. Mark Cheng traveled to Thailand to train intensively with the colonel. "From sunup to sundown the colonel taught me krabi krabong's trademark weapon, the daab song mue (double sword)," he said. "By the end of the week I was able to use live blades so fast that I raised sparks with almost every movement. It was one of the dopest experiences of my life." In this exclusive video, sparks fly (literally!) as Dr. Cheng demonstrates one of the double-sword lessons he learned from Col. Buayam.