Some good points raised there supporting that scenario. But to be blunt I don't believe he brought a full magazine to the farm and took it away with him. I don't think he even owned or had access to one, he may have considered the risk of being caught with it as too big. Also, if you're taking an empty cartridge home why not take the silencer? Furthermore, if he had an additional magazine why leave it downstairs, that isn't logical. The scenario regarding Nevill depends on how incapacitated he was by the four shots you described. Was he able to maintain forward motion continuosly despite these shots? If he was he may have got downstairs first. Difficult to say, he would have been stunned or stopped at some point, I expect. I wouldn't expect Nevill to have left the room while Jeremy was still firing at his wife. Another factor, how long does it take to discharge 9 shots with a semi-automatic? As you suggest, if Nevill was going downstairs first you would expect evidence of a struggle in the upper hallway, stairwell or lower hallway. There isn't any evidence of that, although there is Nevill's blood on the wall in the downstairs hallway. The struggle in the kitchen suggests to me Nevill slightly surprising Jeremy while he was reloading individual bullets not a magazine. Perhaps he reloaded 4 at this point which he used on Nevill in the kitchen before needing to reload again. If Jeremy had followed Nevill downstairs why did he not attack him from behind, pushing him downstairs for instance could've rendered serious damage. And remember Nevill never reached the phone or too close to any exiting door, so if Jeremy was behind him it wasn't very far.