That link is the video you're referring to, I believe. One black combatant blocks a white combatant kicks and the poor guys shin breaks in half? But consider the physics in the kick, man. Those are strong, trained muscles. And any Muay Thai student will tell you, your shins will hurt for a very, very long time before you can kick without worrying about injuring the bone.
The way Muay Thai kicks are thrown involve less knee-joint action and more hip-twist. The result is less control but remarkably fast and powerful blows. The goal is to strike with the lower area or center of the shin - the small bones of the foot and instep can be easily broken via this kicking method. Do a Google search, find some clips, you'll see.
Hope that helps.
- Op. Skinny Ninja