t.28.1            If a competitor crosses one the lateral boundaries of the piste, they must step back one metre from the point where they left the piste; and if they go off the piste during an attack they must return to the position they occupied when they started their attack and then step back a further metre

[but cf t.29 still remains] A competitor who involuntarily crosses one of the boundaries of the strip as the result of any accidental cause (such as jostling) incurs no penalty whatever.