I was watching some of Paul Vunak's stuff and was really unimpressed by this technique. One of his students clocked him twice pretty damn hard while he was trying to do it in light sparring. Chin exposed, weak hits, and it seems like all you have to do is drop your head a little and let the guy break his wrists on your dome while you punch him in the liver or take him down. I saw some guy try it on fedor in one of his early fights. It was really ineffective. Was this really how bruce lee fought? Was it actually effective?