- Sensei by day - Jiu-jitsu instructor by day, vigilante by night... Helen is a daunting black-belt who devotes her free time to punishing wife-beaters, those criminals the law ignores... Here three of them will learn to their sorrow that this invincible woman's -locks and pressure-point strikes cause excruciating pain. (Prod. : Skilled Girl with Girl-Power, shot in Saint-Petersburg, scripted by N. Burch). This video has English sub-titles.