I am interested in the "History of the Heel-Hook". Anyone info on the roots and the evolution of the heel-hook? Everyone's thinking the heel-hook is a traditional sambo move. (I'm not certain it's even in traditional sambo?) Also funny that there is no heel-hooking in Bjj, when it was clearly meant by GM Helio to be part of their system. No wonder everyone is clueless about heel-hooks, their little known history, their infamy, their illegality, their technical difficulty.... Hmmm. Grappling historians, I call to thee, teach me the lineage of the infamous heel-hook.