master wanting to embarrass Zhou by knocking him off the bridge with a shoulder strike, Zhou prepared for a counter-attack and began to swallow air with a subtle “Hm!” and focused all of his energy to his right shoulder. The skin of his shoulder turned red then purple and became hard as rock underneath his clothing. When the two men brushed shoulders, the young man was nearly knocked off of the bridge and the pain caused saliva to pour from his mouth. The attack left him weak in the knees and one side of his body was completely numb. But the incident was a misunderstanding. The young man was none other than his future student, the Water Margin bandit Wu Song who was looking down at his feet to avoid large water puddles born from a freak rain shower. See also Dim mak Iron Palm References External links http://www.internalkungfu.ca/download8.wmv https://www.youtube.com/watch?v=TvPyIGGuOu4 Iron Shirt instructional video "Iron Shirt" TIE BU SHAN GONG "Iron Shirt Tónic - Tónico Camisa de hierro - Lima Perú" TIE BU SHAN BUPIN Chinese martial arts terminology