How do you know he wasn't worried and that's why, as Grahame suggested, he made the phone call.
Professional? Are you suggesting cops don't make mistakes? How many times have you argued that the crime scene was badly handled - professional? They were pretty incompetent that day!!
Someone planning and executing such a heinous crime would have to be a psychopath and as such would feel no fear just concern about covering their arse! Jeremy thought he had - with the phone call.
How do you know he could have been? Why would a worried man who had just shot his entire family make up a silly call to himself? Oh, I get it to give himself an alibi so they would not suspect a blunder.
So, he called himself, got on a bike, rode through the back fields with a wet suit on, got undressed, showered, disposed of his wet suit or any other piece of clothing all in 11 minutes and made his call to police at 3:26 yet in court it was established that called JM at 3am and JB said his father phoned him about 3:15.
3:00 all is going well at the farm I have been up all night.
3:15 Phone call from WHF to GH
3:26 Call to police