How did she wield the rifle? The manner in which it was supposedly used. There's plenty of ways, pick one.
Do you mean when Sheila knocked her dad out, General?
Well I cant be specific, but obviously it was the stock/butt that made contact with Nevills head, causing a bit to splinter off the end and cause cracks around the trigger guard.
So take your pick! Either Sheila raised up the rifle and took the butt down on Nevills head or she swung it like a bat.
In my opinion, this had to happen at the onset of the massacre around 12.00, a severe beating later on once Nevill was shot to pieces just doesn't fit! as I have pointed out, he was at deaths door at this time and little threat.
Also, why would the killer prod and whack Nevill with the rifle barrel and then all of a sudden decide to break the butt over Nevills head? Doesn't fit, does it?
Likewise, the killer couldn't bash Nevill over the head first of all in the kitchen, else he would have been knocked out and unable to hold up his arm to be prodded, would he?
No the evidence undoubtably shows that Nevill had the rifle broken over his head at the outset around 12.00 and then recieved the prodding/whacking later on when he was at deaths door and only had one good arm to hold up.
Gee Whizz, its obvious Nevill was slumped in a chair for the whacking to his shoulders anyway, how else could the killer reach? Couldn't be done while Nevill was standing, could it?
No, its pretty clear what the sequence of events were, General, which fit in nicely with the Aga burns, dont you think, sir?