Actually you have this act of emergency law in Norway.
Examples of this is:
Someone is badly hurt, you have to get to hospital fast. There has been incidents where the police have dropped all fines / charges for the drivers when they can prove they drove a sick / ill person.
Also, there was this neightbour who killed the other neightbour's dog. What happend next was that the owner of the dog whent on a rampage, and eneded up murdering the one who shot. The court came to the conclusion that it was an provoken accident, and that the owner of the dog got and mental break-down when his dog died, therfor he did not go to jail for the episode.
I sadly don't have scource for this one, but it was a big discussion regarding this on school, wheter or not this was the right judgement.
Lastly, there are self defence laws here. If someone is threatning your life, you can apply force back. By that means that if someone is trying to kill you, you can try to harm the person
However, it need to be good evidences that you were in danger, before you can use the self defence act in a court.