Interference by third persons

Every person who, in justifiably using force against a person, is obstructed or resisted by a third person, may in any case use such force against the third person not extending to a blow, wound or grievous harm, as is necessary for overcoming the obstruction or resistance, and may, if the obstruction or resistance amounts to a crime or to abetment of a crime, use force in accordance with the provisions of this Title with respect to the use of force in case of necessity for preventing crime.