Anyway,dont you think its a big ask for anyone to believe that JB was so confident,that he could simply shoot everyone else and count on Sheila to more or less sit down and agree to be shot,Give up her life without question.Was he that good at reading Sheilas mind,so confident she wouldnt try and fight or run away.Was he better at diagnosing his sister than a psychologist.Did he know simply by looking at her that evening,that she was in no state to put up any resistance.Did he have knowledge of the drugs she was taking and their effect.Did he really think anyone would sleep through a gruesome massacre.After all,it wasnt a burglary,where he would sneak in and out again as quietly as possibe.It was a SHOOTING with GUNS.Not the quietest situation to sleep through,although we are told the rifle was more or less silent by the guilters.He had to contain five humans and a yapping dog in a large house,no one could be allowed to flee the house or phone for help.And on top of all that,one of the intended victims had to PLAY THE GAME as it were,and wait her turn.But luckily for JB she woke up on on cue and entered her parents bedroom moments before JB came back up from the kitchen,ready to be shot.And you wonder why some people have reasonable doubt.