For Anglolawyer
http://criminallawza.net/2014/05/28/criminal-law-in-4d/
" In the case of private/self-defence the value judgments (made by Courts) to date allow us to set out the requirements of the defence as follows:
1. You can only resort to force in response to an attack against you that is unlawful itself (you can’t resort to force against someone who is acting lawfully, such as in the execution of a warrant of arrest against you);
2. It must have commenced or be imminent (It is possibly worth noting the ground breaking decision of Satchwell J in (Engelbrecht 2005 WLD) in which she accepted that it is enough if the attack was ‘inevitable’.);
3. It must be an attack against a legally protected interest of yours or of another person (life, limb, or property of substantial value);
4. It must be necessary to resort to force;
5.
That force must be directed at the attacker (not someone else); and
6. The extent of force must be necessary and reasonable – for instance, you cannot shoot someone for threatening you with a light assault.