PART II—OFFENCES AGAINST THE PERSON
CHAPTER 1—JUSTIFIABLE FORCE AND HARM
Section 37—Use of Force for Prevention of or Defence Against Crime, Etc.
For the prevention of, or for the defence of himself or any other person against any crime, or for the suppression or dispersion of a riotous or unlawful assembly, a person may justify any force or harm which is reasonably necessary extending in case of extreme necessity, even to killing.
Necessity - national proceedings
EDIT.