Biu Tze, translated as 'darting fingers', gives the understanding of a fierce and deadly art form, and this is true. Although this art form is now openly taught in many Wing Chun schools around the world ( but not in all ), it was, back in the days of old, taught to those "inside the door", meaning it wasn't taught freely to any student. The Wing Chun School strikes the balance - Biu Tze is part of the curriculum, as the complete system is taught. However, a responsibility is on our instructors not to give a loaded weapon to someone not mature enough to handle it.