TIL of 67 yr-old 4'10" 100 lb Lorenza Marrujo, aka “Lady Ninja” who has a black belt in jiujitsu. When she saw a 5'9" 170 lb man attacking her friend, Lorenza bent his fingers back, hit him twice with her elbow in his sternum, and pinned him to the floor with knees on neck & chest till help arrived.