mr. cov was a cook at villamor air base. he was afraid of bad elements. one evening, before going to bed, he locked himself in his room by placing a chair against the door. after having gone to bed, he was awakened by someone trying to open the door. he called out twice,"who is there" but received no answer. fearing that the intruder was a robber he leaped from his bed and called out again," if you enter the room i will kill you". but at that precise moment , he was struck by the chair that been placed against the door, and believing that he was being attacked he seized a kitchen knife and struck and fatally wounded the intruder who turned out to be his roommate. what is the criminal liability of mr. cov?