Maybe the 3 hours gave his bullet wounds to mouth sufficient time to heal so he could speak to Jeremy in the phone without any noticeable speech impairment
How does Snow explain the phone call being cut off in mid flow if Sheila was upstairs. Seems a real weakness in his theory
Nevill wasn't shot in the face when he phoned JB, Jonathan!
Nevill initially found Sheila in the kitchen who smashed his face with the rifle butt causing a broken nose , two black eyes and a fractured skull, this is when the stock was broken obviously with the piece of wood ending up in front of the Aga where Nevill fell down.
Once Nevill regained consciousness he was obviously very unsteady on his feet and shaken up, he dragged himself onto a chair and decided to phone JB while he composed himself, only saying a few words 'please come over, your sister has gone crazy and has the gun', meaning that Sheila had gone crazy and bashed him with the rifle, after all, what more could he tell JB at that stage? He had no idea what Sheila had done while he was knocked out beside the Aga!
So I think Nevill ended the call himself as he was anxious to get upstairs! Maybe his hand was shaking and he partly placed the phone back on the cradle ending the call, but missed and ended up leaving the phone off the hook. After all he had a severe injury at that time, Jonathan, something that Vanezis may be able to verify hopefully!