Chapter II. General Conditions for Imposition of Penalties.
Art. 12
Any act committed in self-defence shall not be punishable to the extent that the act was necessary in defence against an unlawful attack already commenced or imminent, or in order to avert such attack, provided that means of defence employed are not obviously more dangerous than warranted by the attack and the damage to be expected in its consequence.
A person who has exceeded the limits of permitted self-defence as a result of having been so frightened or startled that he or she could not exercise full restraint, shall not be punished.
Self-defence - national proceedings
EDIT.