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A couple things come to mind;
eye gouges, biting the cheeks and throat, raking the face (leaves tissue under the nails for DNA) small joint manipulation with gusto, neck breaks from guard. Grabbing the lower jaw with both hands (knuckles in the mouth) and violently jerking and twisting Hopefully they dont have to deal with multiple attackers. Brutality and sudden forceful application of technique is often not emphasized out of fear that it will make people uncomfortable.