Given below are a legal principle and a factual situation. Apply the given legal principle to the factual situation and select the most appropriate answer to the question given below:
Principle: Every person has a right of self-defence,if his life is under imminent threat.
Facts: Mr. Prashant threatens Mr. Krishna that he will kill Mr. Krishna. After saying so, Mr. Prashant goes to his house saying that he would get his axe.