I did psychology at A level, got a B, Memory is the easiest, its cog thats bollocks!! i have a question for you all though

This question is asked to murderers to determin whether they have the mind of a serial killer:
"Its your mums funeral, everyone is there saying their goodbyes. Your feeling really down and upset but want to put on a brave face. While your sat down, a stunning women comes over and sits next to you, you get on great, she really cheers you up. You end up spending the afternoon with her, just talking about memories, she's a great listener, infact she's perfect. As it comes to the end of the day you get dragged off with your family, when you go back the women has gone and you didn't get her number!!! Aweek later you kill your brother........why??"