40 Of course, having regard to the appellant's evidence, which I have endeavoured to summarise, as to the events which occurred when he entered Downie's house, there was again nothing which could be relied upon as evidence of the absence of a reason to kill Downie. Defence counsel submitted to the jury that there was an acceptable explanation as to how the fracas, of which the appellant spoke, commenced with a blow struck in response to the appellant's discovery that Downie was sexually interfering with him, a fracas which then, on the appellant's evidence, simply got out of hand and led to a struggle in the course of which Downie unfortunately, in some way which was substantially unexplained, was caused to cut his throat repeatedly. In short, it was not the case that the defence was able to rely upon affirmative evidence of an absence of a motive to kill.