if the facts proved establish that the deceased was performing in the presence in the actual presence of the accused some act which the accused did genuinely believe and which an ordinary person of the community to which the accused belongs would genuinely believe to be an act of witchcraft against him … he might be angered to such an extent that he might be deprived of the power of self control and induced to assault the person doing the witchcraft. And if this be the case a defence of sudden provocation is open to him.43