SaiFightsMS you are on the correct path. Lets think back to the days of the Samuri and when Matsumura was the head guard at Shuri castle. Do you think they would wast time doing these same blocks we still do today if they didnt work? First if they didnt work they would get killed or thier famly would ect. Sport didnt really exist it was life or death. These blocks we learn and do are all very very effective but maybe not in the way you have shown. They are all strikes, Joint locks, arms bars and ect. as SaifightsMS said a down block can be a groin strike ,and really so much more its a great arm bar,or finger lock to . pm or email if your interested in more I have probably siad to much to the genral public now.