Imagine you are walking along the street in the night. Suddenly you see several criminals which have gripped a woman, they are robbing her and going to rape her. The woman is screaming. The criminals are likely forearmed. What will you do 1) I will call the police, then wait for them and conduct them to the place. In this case the time will possibly be lost 2) I will enter the fight and perhaps I will be killed or crippled.