Part 2: Lop Sau, Chee Sau and Dummy Theory By Randy Williams. Randy Williams is one of the premier Wing Chun instructors in the world. Already a proven star for Unique Publications Video, now he's back with more. Wooden Dummy Training is a two-part series. In this DVD, Randy focuses on drills such as: the Lop Sau/Fon Sau Switch, the Chahng Dai Jyeung Switch, the Biu Sau Switch, the Gum Sau Switch and the Pack Sau Switch. He then goes into Look Sau-Rolling Hands, the Triple Uppercut, Sticky Foot, the Dummy Centerline Theory and more! Approximately 56 minutes When Steven Seagal, Phil Collins or Eric Clapton needed bodyguard protection, they called Wing Chnu master Randy Williams, one of the world's foremost experts on self-defense. Williams, who operates schools in various parts of the world, began training at the age of 13 under George Yau and completed his instruction in the system under world renown master Augustine Fong.