That's assuming Neville would get to her before she had a chance to shoot at him
Well he had time to pick up a phone and dial Bamber, tell him Sheila/sister is going berserk with a gun so i would naturally think he had chance. Even after taking four shots upstairs he managed to get downstairs again. We are talking about a former RAF pilot here David, fearless, brave and used to planning to detail? 6'4" tall, farmer and Magistrate having to deal with Sheila running about his farmhouse in her nightie and no footwear not used to shooting, not used to shooting quick, not used to reloading, yes he had chance to get to her, anxiety no matter what time of the day or night would have kicked his adrenalin in and his survival instinct, especially after making a frantic phone call to his son, or so we are lead to believe. That's why I believe he was taken by surprise in the bedroom, with no chance or time to make a phone call and he made his way downstairs to get his shotgun, his only defence after taking four quick shots?