Sorry Mike, I forgot that the police shot Sheila.
I agree there was a struggle in the kitchen. The struggle over the control of the rifle resulted in the aga scratches, smashed ceiling light & some of the upturned furniture. However this would not have damaged or dislodged the watch.
The watch was damaged and dislodged from Nevill's wrist when Nevill put his forearms infront of his head. To shield rifle blows so forceful Nevill's forearms and wrists were bruised.
Once Nevill's arms stopped providing head protection, the rifle blows started hitting Nevill's head. Giving him multiple head lacerations & knocking him out. This was also when the rifle stock broke.
With Nevill knocked out, Sheila could now breach, chamber & re load.