"discourteous to one of tom's friends" I think you mean Martin's friends, I am curious as to whether or not Tom is a friend of Martin's. Maybe he isn't and maybe he is. Maybe Tom is a friend of Martin's and has been stalking Katrine. Maybe Martin and Tom are in on it together, but if thats the case then why didnt Martin knock her out? more I suppose, it needs more depth more story to go on.