Section 43 - Use of force against a third person

A person who, in justifiably using force against another person, is obstructed or resisted by a third person, may use force against the third person, that is reasonably necessary for overcoming the obstruction or resistance; and may, if the obstruction or resistance amounts to a criminal offence or to abetment of a criminal offence, use force in accordance with this Chapter with respect to the use of force in case of necessity for preventing a criminal offence.